UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

      x

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2004

OR

      o

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                to                .

Commission File No. 1-2745

Southern Natural Gas Company

(Exact name of registrant as specified in its charter)

Telephone Number: (713) 420-2600

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: None

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes  þ  No  o

     Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  þ

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).  Yes  o  No  þ

     State the aggregate market value of the voting stock held by non-affiliates of the registrant: None

     Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.

     Common Stock, par value $1 per share. Shares outstanding on March 29, 2005:  1,000

     SOUTHERN NATURAL GAS COMPANY MEETS THE CONDITIONS OF GENERAL INSTRUCTION I(1)(a) AND (b) TO FORM 10-K AND IS THEREFORE FILING THIS REPORT WITH A REDUCED DISCLOSURE FORMAT AS PERMITTED BY SUCH INSTRUCTION.

Documents Incorporated by Reference: None

SOUTHERN NATURAL GAS COMPANY

TABLE OF CONTENTS

      Below is a list of terms that are common to our industry and used throughout this document:

      When we refer to cubic feet measurements, all measurements are at a pressure of 14.73 pounds per square inch.

      When we refer to “us”, “we”, “our”, or “ours”, we are describing Southern Natural Gas Company, and/or our subsidiaries.

PART I

ITEM 1. BUSINESS

General

      We are a Delaware corporation incorporated in 1935. In October 1999, we became a wholly owned subsidiary of El Paso Corporation (El Paso) through the merger of Sonat Inc. with El Paso. Our primary business consists of the interstate transportation and storage of natural gas. We conduct our business activities through our natural gas pipeline systems, which include our Southern Natural Gas pipeline system and our 50 percent ownership interest in Citrus Corp. (Citrus), our liquefied natural gas (LNG) receiving terminal and our storage facilities as discussed below.

      The Pipeline Systems. The Southern Natural Gas system consists of approximately 8,000 miles of pipeline with a design capacity of approximately 3,437 MMcf/d. During 2004, 2003 and 2002, average throughput was 2,163 BBtu/d, 2,101 BBtu/d and 2,151 BBtu/d. Our interstate pipeline system extends from natural gas fields in Texas, Louisiana, Mississippi, Alabama and the Gulf of Mexico to markets in Louisiana, Mississippi, Alabama, Florida, Georgia, South Carolina and Tennessee, including the metropolitan areas of Atlanta and Birmingham. We are the principal natural gas supplier to the growing southeastern markets of Alabama and Georgia. Since 2001, the Federal Energy Regulatory Commission (FERC) has approved and we have placed in service our South System I, South System II and North System II expansions. These expansions make up approximately 700 MMcf/d of our total design capacity.

      We also have a 50 percent ownership interest in Citrus, a Delaware corporation. Citrus owns 100 percent of the Florida Gas Transmission system, which consists of approximately 4,870 miles of pipeline with a design capacity of 2,082 MMcf/d. During 2004, 2003 and 2002, average throughput was 2,014 BBtu/d, 1,963 BBtu/d and 2,004 BBtu/d. This system extends from south Texas to south Florida. For more information regarding our investment in Citrus and the Florida Gas Transmission system, see Part II, Item 8, Financial Statement and Supplementary Data, Note 11 as well as Citrus’ audited financial statements and related notes beginning on page 43 of this Form 10-K.

      LNG Terminal. Our wholly owned subsidiary, Southern LNG Inc. (SLNG), owns an LNG receiving terminal, located on Elba Island, near Savannah, Georgia, which is capable of achieving a peak sendout of 675 MMcf/d and a base load sendout of 446 MMcf/d. The terminal was placed in service and began receiving deliveries in December 2001, after having been idle for a number of years. The capacity at the terminal is contracted with a subsidiary of British Gas, BG LNG Services, LLC. In 2003, the FERC approved our plan to expand the peak sendout capacity of the Elba Island facility by 540 MMcf/d and the base load sendout by 360 MMcf/d (for a total peak sendout capacity once completed of 1,215 MMcf/d and a base load sendout of 806 MMcf/d). The expansion is estimated to cost approximately $157 million and has a planned in-service date of February 2006.

      Storage Facilities. Along our Southern Natural Gas pipeline system, we have approximately 60 Bcf of underground working natural gas storage capacity through our Muldon storage facility in Monroe County, Mississippi, which has a storage capacity of 31 Bcf, and our 50 percent interest in Bear Creek Storage Company (Bear Creek), with our proportionate share of storage capacity of 29 Bcf.

      Bear Creek is a joint venture that we own equally with our affiliate, Tennessee Storage Company (TSC), a subsidiary of Tennessee Gas Pipeline Company (TGP), also our affiliate. Bear Creek owns and operates an underground natural gas storage facility located in Louisiana. The facility has a capacity of 50 Bcf of base gas and 58 Bcf of working storage. Bear Creek’s working storage capacity is committed equally to TGP and us under long-term contracts.

Regulatory Environment

      Our interstate natural gas transmission system, storage and terminalling operations are regulated by the FERC under the Natural Gas Act of 1938 and the Natural Gas Policy Act of 1978. Our pipeline systems, LNG terminal and storage facilities operate under FERC-approved tariffs that establish rates, terms and conditions for service to our customers. Generally, the FERC’s authority extends to:

      • certification and construction of new facilities;

      • extension or abandonment of services and facilities;

      • maintenance of accounts and records;

      • relationships between pipeline and energy affiliates;

      • terms and conditions of services;

      • depreciation and amortization policies;

      • acquisition and disposition of facilities; and

      • initiation and discontinuation of services.

      The fees or rates established under our tariffs are a function of our costs of providing services to our customers, and include provisions for a reasonable return on our invested capital. Approximately 94 percent of our 2004 transportation services and storage revenue is attributable to reservation charges paid by firm customers. Firm customers are those who are obligated to pay a monthly reservation charge, regardless of the amount of natural gas they transport or store, for the term of their contracts. The remaining six percent of our transportation services and storage revenue is variable. Due to our regulated nature and the high percentage of our revenues attributable to reservation charges our revenues have historically been relatively stable. However, our financial results can be subject to volatility due to factors such as changes in natural gas prices and market conditions, regulatory actions, competition, weather and the creditworthiness of our customers. We also experience volatility in our financial results when the amounts of natural gas and electricity utilized in operations differ from the amounts we receive for those purposes.

      Our interstate pipeline systems and LNG terminal are also subject to federal, state and local statutes and regulations regarding pipeline and LNG plant safety and environmental matters. Our systems have ongoing inspection programs designed to keep all of our facilities in compliance with environmental and pipeline safety requirements. We believe that our systems are in material compliance with the applicable requirements.

      We are subject to regulation over the safety requirements in the design, construction, operation and maintenance of our interstate natural gas transmission system and storage facilities by the U.S. Department of Transportation. Our operations on U.S. government land are regulated by the U.S. Department of the Interior and our LNG terminalling business is regulated by the U.S. Coast Guard.

      A discussion of our significant rate and regulatory matters is included in Part II, Item 8, Financial Statements and Supplementary Data, Note 7 and is incorporated herein by reference.

Markets and Competition

      Our markets consist of distribution and industrial companies, electric generation companies, natural gas producers, other natural gas pipelines, and natural gas marketing and trading companies. We provide transportation and storage services in both our natural gas supply and market areas. Our pipeline system connects with multiple pipelines that provide our shippers with access to diverse sources of supply and various natural gas markets serviced by these pipelines.

      A number of large natural gas consumers are electric utility companies who use natural gas to fuel electric power generation facilities. Electric power generation is the fastest growing demand sector of the natural gas market. The growth and development of the electric power industry potentially benefit the natural gas industry by creating more demand for natural gas turbine generated electric power, but this effect is offset, in varying degrees, by increased generation efficiency, the more effective use of surplus electric capacity and increased natural gas prices. The increase in natural gas prices, driven in part by increased demand from the power sector, has diminished the demand for natural gas in the industrial sector. In addition, in several regions of the country, new additions in electric generation capacity have exceeded load growth and transmission capabilities out of those regions. These developments may inhibit owners of new power generation facilities from signing firm contracts with us.

      Imported LNG is one of the fastest growing supply sectors of the natural gas market. Terminals and other regasification facilities can serve as important sources of supply for pipeline customers, enhancing the delivery capabilities and operational flexibility, and complementing traditional supply transported into market areas.

      Our existing transportation and storage contracts mature at various times and in varying amounts of throughput capacity. Our ability to extend our existing contracts or remarket expiring capacity is dependent on competitive alternatives, access to capital, the regulatory environment at the local, state and federal levels and market supply and demand factors at the relevant dates these contracts are extended or expire. The duration of new or renegotiated contracts will be affected by current prices, competitive conditions and judgments concerning future market trends and volatility. While we are allowed to negotiate contracts at fully subscribed quantities and at maximum rates allowed under our tariffs, we must, at times, discount our contracts to remain competitive.

      The following table details the markets we serve and the competition on our Southern Natural Gas pipeline system as of December 31, 2004:

Environmental

      A description of our environmental activities is included in Part II, Item 8, Financial Statements and Supplementary Data, Note 7, and is incorporated herein by reference.

Employees

      As of March 24, 2005, we had approximately 480 full-time employees, none of whom are subject to a collective bargaining arrangement.

ITEM 2. PROPERTIES

      A description of our properties is included in Item 1, Business, and is incorporated herein by reference.

      We believe that we have satisfactory title to the properties owned and used in our businesses, subject to liens for taxes not yet payable, liens incident to minor encumbrances, liens for credit arrangements and easements and restrictions that do not materially detract from the value of these properties, our interest in these properties, or the use of these properties in our businesses. We believe that our properties are adequate and suitable for the conduct of our business in the future.

ITEM 3. LEGAL PROCEEDINGS

      A description of our legal proceedings is included in Part II, Item 8, Financial Statements and Supplementary Data, Note 7, and is incorporated herein by reference.

      In June 2003, we notified the Louisiana Department of Environmental Quality (LDEQ) that we had discovered possible compliance issues with respect to operations at our Toca Compressor Station. In December 2003, the LDEQ issued a Consolidated Compliance Order and Notice of Potential Penalty. Our Toca Compressor Station will invest an estimated $6 million to upgrade the station’s environmental controls and the upgrade will be completed in early 2005. We filed a revised permit application and plan for compliance in January 2004 and paid a penalty of $66,000, resolving the matter.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

      Item 4, Submission of Matters to a Vote of Security Holders, has been omitted from this report pursuant to the reduced disclosure format permitted by General Instruction I to Form 10-K.

PART II

MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

      All of our common stock, par value $1 per share, is owned by El Paso and, accordingly, our stock is not publicly traded.

      We pay dividends on our common stock from time to time from legally available funds that have been approved for payment by our Board of Directors. In March 2003, in connection with El Paso’s contribution of its interest in Citrus to us, we declared and paid a $600 million dividend, $310 million of which was a distribution of affiliated receivables and $290 million of which was cash. No common stock dividends were declared or paid in 2004 or 2002.

ITEM 6. SELECTED FINANCIAL DATA

      Item 6, Selected Financial Data, has been omitted from this report pursuant to the reduced disclosure format permitted by General Instruction I to Form 10-K.

      The information required by this Item is presented in a reduced disclosure format pursuant to General Instruction I to Form 10-K. The notes to our consolidated financial statements contain information that is pertinent to the following analysis, including a discussion of our significant accounting policies. As discussed in Part II, Item 8, Financial Statements and Supplementary Data, Note 1 our financial statements for the years ended December 31, 2003 and 2002 have been restated for the manner in which we originally applied the provisions of Statements of Financial Accounting Standards (SFAS) No. 141 and SFAS No. 142.

Overview

      Our business primarily consists of interstate natural gas transmission, storage and terminalling operations. Our interstate natural gas transportation system, natural gas storage and LNG terminalling businesses face varying degrees of competition from other pipelines and proposed LNG facilities, as well as from alternative energy sources used to generate electricity, such as hydroelectric power, coal and fuel oil.

      The FERC regulates the rates we can charge our customers. These rates are a function of the costs of providing services to our customers, including a reasonable return on our invested capital. As a result, our revenues have historically been relatively stable. However, our financial results can be subject to volatility due to factors such as changes in natural gas prices and market conditions, regulatory actions, competition, weather and the creditworthiness of our customers. We also experience volatility in our financial results when the amounts of natural gas and electricity utilized in operations differ from the amounts we receive for those purposes. In 2004, 94 percent of our transportation services and storage revenues were attributable to reservation charges paid by firm customers. The remaining six percent was variable.

      Our ability to extend existing customer contracts or remarket expiring contracted capacity is dependent on the competitive alternatives, the regulatory environment at the federal, state and local levels and market supply and demand factors at the relevant dates these contracts are extended or expire. The duration of new or renegotiated contracts will be affected by current prices, competitive conditions and judgments concerning future market trends and volatility. Subject to regulatory constraints, we attempt to recontract or remarket our capacity at the maximum rates allowed under our tariffs, although at times, we discount these rates to remain competitive. Our existing contracts mature at various times and in varying amounts of throughput capacity. We continue to manage our recontracting process to mitigate the risk of significant impacts on our revenues. The weighted average remaining contract term for active contracts is approximately five years as of December 31, 2004.

      Below is the contract expiration portfolio for all contracts executed as of December 31, 2004, including those whose terms begin in 2005 or later. When these contracts are included, the portfolio has a weighted average remaining contract term of approximately 6.5 years.

Results of Operations

      Our management, as well as El Paso’s management, uses earnings before interest expense and income taxes (EBIT) to assess the operating results and effectiveness of our business. We define EBIT as net income adjusted for (i) items that do not impact our income from continuing operations, (ii) income taxes, (iii) interest and debt expense and (iv) affiliated interest income. Our business consists of consolidated operations as well as investments in unconsolidated affiliates. We exclude interest and debt expense from this measure so that our management can evaluate our operating results without regard to our financing methods. We believe the discussion of our results of operations based on EBIT is useful to our investors because it

allows them to more effectively evaluate the operating performance of both our consolidated business and our unconsolidated investments using the same performance measure analyzed internally by our management. EBIT may not be comparable to measurements used by other companies. Additionally, EBIT should be considered in conjunction with net income and other performance measures such as operating income or operating cash flow.

      The following is a reconciliation of EBIT to net income for the years ended December 31:

     The following items contributed to our overall EBIT increase of $38 million for the year ended December 31, 2004 as compared to 2003:

      The following provides further discussions on some of the significant items listed above as well as events that may affect our operations in the future.

      Mainline Expansions. Our mainline expansions consist of three major projects that were phased into service from June 2002 through August 2004. The increase in expansion revenue is offset by depreciation on the new facilities and the elimination of allowance for funds used during construction (AFUDC).

      During the past two years, we have completed the following expansion projects that have generated new sources of revenues:

      Phase II of our South System II expansion project was placed in-service in 2004, at a total cost of approximately $256 million.

      In April 2003, the FERC approved our expansion of our Elba Island LNG facility to increase the base load sendout rate of the facility from 446 MMcf/d to 806 MMcf/d. Our current cost estimates for the expansion are approximately $157 million, and expenditures as of December 31, 2004 were approximately $83 million. We commenced construction in July 2003 and expect to place the expansion in service in February 2006.

      Citrus. Our EBIT increased due to earnings from our equity investment in Citrus. In 2004, Citrus exited its trading business, and as a result, incurred a favorable earnings impact.

      Gas Not Used in Operations and Other Gas Sales. The financial impact of operational gas, net of gas used in operations is based on the amount of gas we are allowed to recover and dispose of according to the provisions in our tariff, relative to the amounts of gas we use for operating purposes, and the price of natural gas. The disposition of gas not needed for operations results in revenues to us, which are driven by volumes and prices during the period. During 2003 and 2004, we recovered, fairly consistently, volumes of natural gas that were not utilized for operations. These recoveries were and are based on factors such as system throughput, facility enhancements and the ability to operate the systems in the most efficient and safe manner. Additionally, a steadily increasing natural gas price environment during this timeframe also resulted in favorable impacts on our operating results in 2004 versus 2003. We anticipate that this area of our business will continue to vary in the future and will be impacted by the outcome of our ongoing rate case, including prospective changes in our tariff provisions governing recovery of operational gas and energy costs as well as the efficiency of our pipeline operations, the price of natural gas and other factors.

      Regulatory Matters. In November 2004, the FERC issued a proposed accounting release that may impact certain costs we incur related to our pipeline integrity program. If the release is enacted as written, we would be required to expense certain future pipeline integrity costs instead of capitalizing them as part of our property, plant and equipment. Although we continue to evaluate the impact that this potential accounting release will have on our consolidated financial statements, we currently estimate that we would be required to expense an additional amount of pipeline integrity expenditures in the range of approximately $5 million to $7 million annually over the next eight years.

      In November 2004, the FERC issued a Notice of Inquiry (NOI) seeking comments on its policy regarding selective discounting by natural gas pipelines. The FERC seeks comments regarding whether its practice of permitting pipelines to adjust their ratemaking throughput downward in rate cases to reflect discounts given by pipelines for competitive reasons is appropriate when the discount is given to meet competition from another natural gas pipeline. We, along with several of our affiliated pipelines, filed comments on the NOI in March 2005. The final outcome of this inquiry cannot be predicted with certainty, nor can we predict the impact that the final rule will have on us.

      We periodically file for changes in our rates which are subject to the approval of the FERC. In August 2004, we filed a rate case with the FERC seeking an annual rate increase of $35 million, or 11 percent in jurisdiction rates, no changes to cost allocation, rate design or current fuel retention percentage, and certain revisions to our effective tariff regarding terms and conditions of service. We have reached a tentative settlement in principle that will resolve all issues in this rate proceeding.

Interest and Debt Expense

      Interest and debt expense for the year ended December 31, 2004, was $7 million higher than in 2003 primarily due to the issuance in March 2003 of $400 million senior unsecured notes with an annual interest rate of 8.875%.

Income Taxes

      Our effective tax rates were different than the statutory rate of 35 percent in both periods primarily due to state income taxes offset by earnings from unconsolidated affiliates where we anticipate receiving dividends. For a reconciliation of the statutory rate to the effective rates, see Item 8, Financial Statements and Supplementary Data, Note 2.

Liquidity

      Our liquidity needs have been provided by cash flows from operating activities and the use of El Paso’s cash management program. Under El Paso’s cash management program, depending on whether we have short-term cash surpluses or requirements, we either provide cash to El Paso or El Paso provides cash to us. We have historically provided cash advances to El Paso, and we reflect these advances as investing activities in our statement of cash flows. At December 31, 2004, we had a cash advance receivable from El Paso of $171 million as a result of this program. This receivable is due upon demand; however, we do not anticipate settlement within the next twelve months. At December 31, 2004, this receivable was classified as non-current notes receivable from affiliates on our balance sheet. We believe that cash flows from operating activities will be adequate to meet our short-term capital requirements for existing operations.

Capital Expenditures

      Our capital expenditures for the years ended December 31 are as follows:

      Under our current plan, we expect to spend between approximately $63 million and $69 million in each of the next three years for capital expenditures to maintain the integrity of our pipeline and ensure the safe and reliable delivery of natural gas to our customers. In addition, we have budgeted to spend between $80 million and $109 million in each of the next three years to expand the capacity and services of our system for long-term contracts. We expect to fund our maintenance and expansion capital expenditures through a combination of internally generated funds and/or by recovering some of the amounts advanced to El Paso under its cash management program. See Item 8, Financial Statements and Supplementary Data, Note 11 for a discussion of El Paso’s cash management program.

      In September 2004, we incurred significant damage to sections of our offshore pipeline facilities due to Hurricane Ivan. Total costs incurred for 2004 were approximately $11 million and our estimate for future costs are approximately $40 million. We expect insurance reimbursement for the cost of the damage with the exception of our share of a $2 million insurance deductible allocated from El Paso.

Commitments and Contingencies

      For a discussion of our commitments and contingencies, see Item 8, Financial Statements and Supplementary Data, Note 7, which is incorporated herein by reference.

New Accounting Pronouncements Issued But Not Yet Adopted

      As of December 31, 2004, there were a number of accounting standards and interpretations that had been issued, but not yet adopted by us. Based on our assessment of those standards, we do not believe there are any that could have a material impact on us.

RISK FACTORS AND CAUTIONARY STATEMENT FOR PURPOSES OF THE “SAFE HARBOR” PROVISIONS OF THE PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

      This report contains or incorporates by reference forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Where any forward-looking statement includes a statement of the assumptions or bases underlying the forward-looking statement, we caution that, while we believe these assumptions or bases to be reasonable and in good faith, assumed facts or bases almost always vary from the actual results, and the differences between assumed facts or bases and actual results can be material, depending upon the circumstances. Where, in any forward-looking statement, we or our management express an expectation or belief as to future results, that expectation or belief is expressed in good faith and is believed to have a reasonable basis. We cannot assure you, however, that the statement of expectation or belief will result or be achieved or accomplished. The words “believe,” “expect,” “estimate,” “anticipate,” and similar expressions will generally identify forward-looking statements. Our forward-looking statements, whether written or oral, are expressly qualified by these cautionary statements and any other cautionary statements that may accompany those statements. In addition, we disclaim any obligation to update any forward-looking statements to reflect events or circumstances after the date of this report.

      With this in mind, you should consider the risks discussed elsewhere in this report and other documents we file with the Securities and Exchange Commission (SEC) from time to time and the following important factors that could cause actual results to differ materially from those expressed in any forward-looking statement made by us or on our behalf.

Risks Related to Our Business

Our success depends on factors beyond our control.

      Our business is primarily the transportation and storage of natural gas for third parties. As a result, the volume of natural gas involved in these activities depends on the actions of those third parties, and is beyond our control. Further, the following factors, most of which are beyond our control, may unfavorably impact our ability to maintain or increase current transmission and storage volumes and rates, to renegotiate existing contracts as they expire, or to remarket unsubscribed capacity:

The revenues of our pipeline businesses are generated under contracts that must be renegotiated periodically.

      Our revenues are generated under transportation services and storage contracts that expire periodically and must be renegotiated and extended or replaced. Although we actively pursue the renegotiation, extension and/or replacement of these contracts, we cannot assure that we will be able to extend or replace these contracts when they expire or that the terms of any renegotiated contracts will be as favorable as the existing contracts. Currently, our firm transportation capacity is fully subscribed through mid-2005 in our largest market areas, but could be renegotiated at rates below current rates upon the expiration of these contracts. For a further discussion of these matters, see Part I, Business — Markets and Competition.

      In particular, our ability to extend and/or replace transportation services and storage contracts could be adversely affected by factors we cannot control, including:

      If we are unable to renew, extend or replace these contracts or if we renew them on less favorable terms, we may suffer a material reduction in our revenues and earnings.

Fluctuations in energy commodity prices could adversely affect our business.

      Revenues generated by our transportation services and storage contracts depend on volumes and rates, both of which can be affected by the prices of natural gas. Increased natural gas prices could result in a reduction of the volumes transported by our customers, such as power companies who, depending on the price of fuel, may not dispatch gas-fired power plants. Increased prices could also result in industrial plant shutdowns or load losses to competitive fuels and local distribution companies’ loss of customer base. We also experience volatility in our financial results when the amounts of natural gas and electricity utilized in operations differ from the amounts we receive for those purposes. The success of our operations is subject to continued development of additional oil and natural gas reserves in the vicinity of our facilities and our ability to access additional suppliers from interconnecting pipelines, primarily in the Gulf of Mexico, to offset the natural decline from existing wells connected to our systems. A decline in energy prices could precipitate a decrease in these development activities and could cause a decrease in the volume of reserves available for transmission or storage on our system. If natural gas prices in the supply basins connected to our pipeline systems are higher than prices in other natural gas producing regions, our ability to compete with other transporters may be negatively impacted. Fluctuations in energy prices are caused by a number of factors, including:

The agencies that regulate us and our customers affect our profitability.

      Our pipeline businesses are regulated by the FERC, the U.S. Department of Transportation and various state and local regulatory agencies. Our LNG terminalling business is also regulated by the U.S. Coast Guard. Regulatory actions taken by these agencies have the potential to adversely affect our profitability. In particular, the FERC regulates the rates we are permitted to charge our customers for our services. In setting

authorized rates of return in a few recent FERC decisions, the FERC has utilized a proxy group of companies that includes local distribution companies that are not faced with as much competition or risk as interstate pipelines. The inclusion of these companies may create downward pressure on tariff rates when subjected to review at the FERC.

      If our tariff rates were reduced in a future rate proceeding, if our volume of business under our currently permitted rates was decreased significantly or if we were required to substantially discount the rates for our services because of competition, our profitability and liquidity could be reduced.

      Further, state agencies and local governments that regulate our local distribution company customers could impose requirements that could impact demand for our services.

Costs of environmental liabilities, regulations and litigation could exceed our estimates.

      Our operations are subject to various environmental laws and regulations. These laws and regulations obligate us to install and maintain pollution controls and to clean up various sites at which regulated materials may have been disposed of or released. We are also party to legal proceedings involving environmental matters pending in various courts and agencies.

      It is not possible for us to estimate reliably the amount and timing of all future expenditures related to environmental matters because of:

      Although we believe we have established appropriate reserves for liabilities, including clean up costs, we could be required to set aside additional reserves in the future due to these uncertainties, and these amounts could be material. For additional information, see Item 8, Financial Statements and Supplementary Data, Note 7.

Our operations are subject to operational hazards and uninsured risks.

      Our operations are subject to the inherent risks normally associated with pipeline operations, including pipeline ruptures, explosions, pollution, release of toxic substances, fires, adverse weather conditions, and other hazards, each of which could result in damage to or destruction of our facilities or damages or injuries to persons. In addition, our operations face possible risks associated with acts of aggression on our assets, which may include substantial periods to repair or replace our facilities and may include negative impacts on our revenue. If any of these events were to occur, we could suffer substantial losses.

      While we maintain insurance against many of these risks to the extent and in amounts that we believe are reasonable, our financial condition and operations could be adversely affected if a significant event occurs that is not fully covered by insurance.

Four customers contract for a majority of our firm transportation capacity.

      For 2004, our contracts with Atlanta Gas Light Company, Southern Company Services, Alabama Gas Corporation and Scana Corporation represented approximately 27%, 12%, 12% and 10% of our firm transportation capacity. For additional information, see Part I, Item 1, Business — Markets and Competition and Item 8, Financial Statements and Supplementary Data, Note 9. The loss of one of these customers or a decline in its creditworthiness could adversely affect our results of operations, financial position and cash flow.

Risks Related to Our Affiliation with El Paso

      El Paso files reports, proxy statements and other information with the SEC under the Securities Exchange Act of 1934, as amended. Each prospective investor should consider this information and the matters disclosed therein in addition to the matters described in this report. Such information is not incorporated by reference herein.

Our relationship with El Paso and its financial condition subjects us to potential risks that are beyond our control.

      Due to our relationship with El Paso, adverse developments or announcements concerning El Paso could adversely affect our financial condition, even if we have not suffered any similar development. The ratings assigned to El Paso’s senior unsecured indebtedness are below investment grade, currently rated Caa1 by Moody’s Investor Service and CCC+ by Standard & Poor’s. The ratings assigned to our senior unsecured indebtedness are currently rated B1 by Moody’s Investor Service and B- by Standard & Poor’s. Further downgrades of our credit ratings could increase our cost of capital and collateral requirements, and could impede our access to capital markets. El Paso continues its efforts to execute its Long-Range Plan that established certain financial and other objectives, including significant debt reduction. An inability to meet these objectives could adversely affect El Paso’s liquidity position, and in turn affect our financial condition.

      Pursuant to El Paso’s cash management program, surplus cash is made available to El Paso in exchange for an affiliated receivable. In addition, we conduct commercial transactions with some of our affiliates. El Paso provides cash management and other corporate services for us. If El Paso is unable to meet its liquidity needs, there can be no assurance that we will be able to access cash under the cash management program, or that our affiliates would pay their obligations to us. However, we might still be required to satisfy affiliated company payables. Our inability to recover any affiliated receivables owed to us could adversely affect our ability to repay our outstanding indebtedness. For a further discussion of these matters, see Item 8, Financial Statements and Supplementary Data, Note 11.

      In 2004, El Paso restated its 2003 and prior financial statements and the financial statements of certain of its subsidiaries for the same periods due to revisions to their natural gas and oil reserves and for adjustments related to the manner in which they historically accounted for hedges of their natural gas production. As a result of these reserve revisions, several class action lawsuits have been filed against El Paso and several of its subsidiaries, but not against us. The reserve revisions have also become the subject of investigations by the SEC and U.S. Attorney. These investigations and lawsuits may further negatively impact El Paso’s credit ratings and place further demands on its liquidity.

      We are required to maintain an effective system of internal control over financial reporting. As a result of our efforts to comply with this requirement, we determined that as of December 31, 2004, we did not maintain effective internal control over financial reporting. As more fully discussed in Item 9A, we identified several deficiencies in internal control over financial reporting, two of which management has concluded constituted material weaknesses. Although we have taken steps to remediate some of these deficiencies, additional steps must be taken to remediate the remaining control deficiencies. If we are unable to remediate our identified internal control deficiencies over financial reporting, or we identify additional deficiencies in our internal controls over financial reporting, we could be subjected to additional regulatory scrutiny, future delays in filing our financial statements and suffer a loss of public confidence in the reliability of our financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles, which could have a negative impact on our liquidity, access to capital markets and our financial condition.

      In addition to the risk of not completing the remediation of all deficiencies in our internal controls over financial reporting, we do not expect that our disclosure controls and procedures or our internal controls over financial reporting will prevent all mistakes, errors and fraud. Any system of internal controls, no matter how well designed or implemented, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. The design of a control system must reflect the fact that the benefits of controls must be considered relative to their costs. The design of any system of controls also is based in part upon certain

assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions. Therefore, any system of internal controls is subject to inherent limitations, including the possibility that controls may be circumvented or overridden, that judgments in decision-making can be faulty, and that misstatements due to mistakes, errors or fraud may occur and may not be detected. Also, while we document our assumptions and review financial disclosures, the regulations and literature governing our disclosures are complex and reasonable persons may disagree as to their application to a particular situation or set of facts. In addition, the applicable regulations and literature are relatively new. As a result, they are potentially subject to change in the future, which could include changes in the interpretation of the existing regulations and literature as well as the issuance of more detailed rules and procedures.

Our subsidiary may be subject to a change of control under certain circumstances.

      Southern Gas Storage Company, our subsidiary, as well as our ownership in Bear Creek is pledged as collateral under El Paso’s $3 billion credit agreement. As a result, their ownership is subject to change if there is an event of default under the credit agreement and El Paso’s lenders under its credit agreement exercise rights over their collateral.

      Furthermore, we have indentures governing our long-term debt that have cross-acceleration provisions with $10 million thresholds. If we have any debt in excess of $10 million accelerated for any reason, our long-term debt could be accelerated. The acceleration of our long-term debt could also adversely affect our liquidity positions and, in turn our financial condition.

We could be substantively consolidated with El Paso if El Paso were forced to seek protection from its creditors in bankruptcy.

      If El Paso were the subject of voluntary or involuntary bankruptcy proceedings, El Paso and its other subsidiaries and their creditors could attempt to make claims against us, including claims to substantively consolidate our assets and liabilities with those of El Paso and its other subsidiaries. The equitable doctrine of substantive consolidation permits a bankruptcy court to disregard the separateness of related entities and to consolidate and pool the entities’ assets and liabilities and treat them as though held and incurred by one entity where the interrelationship between the entities warrants such consolidation. We believe that any effort to substantively consolidate us with El Paso and/or its other subsidiaries would be without merit. However, we cannot assure you that El Paso and/or its other subsidiaries or their respective creditors would not attempt to advance such claims in a bankruptcy proceeding or, if advanced, how a bankruptcy court would resolve the issue. If a bankruptcy court were to substantively consolidate us with El Paso and/or its other subsidiaries, there could be a material adverse effect on our financial condition and liquidity.

We are a wholly owned subsidiary of El Paso.

      El Paso has substantial control over:

      El Paso may exercise such control in its interests and not necessarily in the interests of us or the holders of our long-term debt.

Risks Related to Citrus Corp.

Florida Gas Transmission Company (FGT) depends substantially upon a small number of customers.

      Upon completion of its current expansion, the five most significant customers on FGT’s pipeline system will account for approximately 74% of contracted capacity, with the two most significant customers, Florida Power & Light Company and TECO Energy, Inc., including its subsidiaries Tampa Electric Company and Peoples Gas System, Inc., being obligated for approximately 39% and 21% of such capacity. Accordingly, failure of one or more of FGT’s most significant customers to pay reservation charges could reduce its revenues materially and have a material adverse effect on its business, financial condition and results of operations.

Important actions by Citrus and FGT require approval by both CrossCountry Energy, LLC (CrossCountry) and us.

      El Paso contributed its 50 percent interest in Citrus to us in March 2003. Effective April 2004, Enron Corp. (Enron), who owned the other 50 percent interest in Citrus, assigned its interest in Citrus to CrossCountry. Citrus’ organizational documents and FGT’s organizational documents require that “important matters” be approved by both CrossCountry and us. Important matters include the declaration of dividends and similar payments, the approval of operating budgets, the incurrence of indebtedness and the consummation of significant transactions. Consequently, we are dependent on CrossCountry’s agreement to effect any such actions. CrossCountry’s interests with respect to these important matters could be different from ours and, accordingly, we may be unable to cause Citrus and FGT to take important actions, such as the payment of dividends and the sale or acquisition of assets.

Citrus depends on CrossCountry entities to provide it with management and support services under an informal administrative services arrangement.

      Various CrossCountry entities provide management and support services to Citrus and its subsidiaries, pursuant to an informal administrative services arrangement. These services include administration, legal, compliance and emergency services. The arrangement was originally governed by the provisions of an operating agreement between a CrossCountry affiliate and Citrus. The operating agreement expired on June 30, 2001 and has not been extended. However, the CrossCountry entities have continued to provide their services under an informal arrangement based on the provisions of the original operating agreement. Under the arrangement, Citrus and its subsidiaries reimburse the CrossCountry entities for costs attributable to the operations of Citrus and its subsidiaries.

      Although we believe that the CrossCountry entities will continue to perform management and support services for Citrus and its subsidiaries, and that Citrus could obtain such services from other sources in a timely and cost effective manner, Citrus may be unable to obtain such services from other sources on terms favorable to Citrus in the event the CrossCountry entities stop providing them. Failure to obtain management and support services in a timely and cost effective manner could have a material adverse effect on Citrus’ business.

Ongoing litigation regarding Citrus Trading Corporation (CTC) could adversely affect our business.

      In March 2003, CTC filed suit against Duke Energy LNG Sales, Inc. (Duke) seeking damages for breach of a gas supply contract under which CTC was entitled to purchase regasified liquefied natural gas. In April 2003, Duke forwarded a letter to CTC purporting to terminate the contract due to the alleged failure of CTC to increase the amount of an outstanding letter of credit backstopping its purchase obligations. On May 1, 2003, CTC notified Duke that Duke was in default under the contract. CTC subsequently filed an amended complaint, alleging wrongful contract termination and specifying damages of $185 million. At this time, the outcome of this litigation is not determinable. For further discussion of these matters, see Item 8, Financial Statements and Supplementary Data, Note 7.

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

      Our primary market risk is exposure to changing interest rates. The table below shows the carrying value and related weighted average effective interest rates of our interest bearing securities, by expected maturity dates, and the fair value of those securities. At December 31, 2004, the fair values of our fixed rate long-term debt securities have been estimated based on quoted market prices for the same or similar issues.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

SOUTHERN NATURAL GAS COMPANY

CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME

(In millions)

See accompanying notes.

SOUTHERN NATURAL GAS COMPANY

CONSOLIDATED BALANCE SHEETS

(In millions, except share amounts)

See accompanying notes.

SOUTHERN NATURAL GAS COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In millions)

See accompanying notes.

SOUTHERN NATURAL GAS COMPANY

CONSOLIDATED STATEMENTS OF STOCKHOLDER’S EQUITY

(In millions, except share amounts)

See accompanying notes.

SOUTHERN NATURAL GAS COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

  Basis of Presentation

      Our consolidated financial statements include the accounts of all majority-owned and controlled subsidiaries after the elimination of all significant intercompany accounts and transactions. Our financial statements for prior periods include reclassifications that were made to conform to the current year presentation. Those reclassifications had no impact on reported net income or stockholder’s equity.

  Restatement

      During the completion of the financial statements for the year ended December 31, 2004, we identified an error in the manner in which we had originally adopted the provisions of Statement of Financial Accounting Standards (SFAS) No. 141, Business Combinations and SFAS No. 142, Goodwill and Other Intangible Assets, in 2002. Upon adoption of these standards, we incorrectly adjusted the cost of investments in unconsolidated affiliates and recorded a cumulative effect of a change in accounting principle for the excess of our share of the affiliates’ fair value of net assets over their original cost, which we believed was negative goodwill. The amount originally recorded as a cumulative effect of an accounting change was $57 million and related to our investment in Citrus. We subsequently determined that the amount we adjusted was not negative goodwill, but rather an amount that should have been allocated to the long-lived assets underlying our investment. As a result, we restated our 2002 financial statements to reverse the amount we recorded as a cumulative effect of an accounting change on January 1, 2002. This adjustment also impacted a related deferred tax adjustment we recorded during 2002. The restatement also affected the investment, deferred tax liability and stockholders’ equity balances we reported as of December 31, 2002 and 2003. Below are the effects of our restatement.

      The restatement did not impact 2003 and 2004 reported income amounts except that we recorded an adjustment related to these periods of $4 million in the fourth quarter of 2004. Other than the effects above, the components of this restatement were immaterial to all previously reported interim and annual periods.

  Principles of Consolidation

      We consolidate entities when we either (i) have the ability to control the operating and financial decisions and policies of that entity or (ii) are allocated a majority of the entity’s losses and/or returns through our variable interest in that entity. The determination of our ability to control or exert significant influence over an entity and whether we are allocated a majority of the entity’s losses and/or returns involves the use of judgment. We apply the equity method of accounting where we can exert significant influence over, but do not control, the policies and decisions of an entity and where we are not allocated a majority of the entity’s losses and/or returns. We use the cost method of accounting where we are unable to exert significant influence over the entity.

  Use of Estimates

      The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires the use of estimates and assumptions that affect the amounts we report as assets, liabilities, revenues and expenses and our disclosures in these financial statements. Actual results can, and often do, differ from those estimates.

     Regulated Operations

      Our natural gas systems and storage operations are subject to the jurisdiction of the FERC in accordance with the Natural Gas Act of 1938 and the Natural Gas Policy Act of 1978, and we currently apply the provisions of SFAS No. 71, Accounting for the Effects of Certain Types of Regulation. We perform an annual study to assess the ongoing applicability of SFAS No. 71. The accounting required by SFAS No. 71 differs from the accounting required for businesses that do not apply its provisions. Transactions that are generally recorded differently as a result of applying regulatory accounting requirements include capitalizing an equity return component on regulated capital projects, postretirement employee benefit plans, and other costs included in, or expected to be included in, future rates.

  Cash and Cash Equivalents

      We consider short-term investments with an original maturity of less than three months to be cash equivalents.

  Allowance for Doubtful Accounts

      We establish provisions for losses on accounts receivable and for natural gas imbalances due from shippers and operators if we determine that we will not collect all or part of an outstanding receivable balance. We regularly review collectibility and establish or adjust our allowance as necessary using the specific identification method.

  Materials and Supplies

      We value materials and supplies at the lower of cost or market value with cost determined using the average cost method.

  Natural Gas Imbalances

      Natural gas imbalances generally occur when the actual amount of natural gas received on a customer’s contract at the supply point differs from the actual amount of natural gas delivered under the customer’s transportation contract at the delivery point. We value imbalances due to or from shippers at specified index prices set forth in our tariff based on the production month in which the imbalances occur. Customer imbalances are aggregated and netted (by customer) on a monthly basis, and settled in cash, subject to the terms of our tariff. For differences in value between the amounts we pay or receive for the purchase or sale of gas used to resolve shipper imbalances over the course of a year, we have the right under our tariff to recover applicable losses through a storage cost reconciliation charge. This charge is applied to all volumes transported on our system. We are obligated annually to true-up any losses or gains obtained during the course of each year in calculating the following years’ storage cost reconciliation charge.

      Imbalances due from others are reported in our balance sheet as either accounts receivable from customers or accounts receivable from affiliates. Imbalances owed to others are reported on the balance sheet as either trade accounts payable or accounts payable to affiliates. In addition, we classify all imbalances as current.

  Property, Plant and Equipment

      Our property, plant and equipment is recorded at its original cost of construction or, upon acquisition, at either the fair value of the assets acquired or the cost to the entity that first placed the asset in service. For assets we construct, we capitalize direct costs, such as labor and materials and indirect costs, such as overhead, interest and an equity return component for our regulated businesses as allowed by the FERC. We capitalize the major units of property replacements or improvements and expense minor items.

      We use the composite (group) method to depreciate property, plant and equipment. Under this method, assets with similar lives and other characteristics are grouped and depreciated as one asset. We apply the FERC-accepted depreciation rate to the total cost of the group until its net book value equals its salvage value. Currently, our depreciation rates vary from one to 20 percent. Using these rates, the remaining depreciable lives of these assets range from one to 57 years. We re-evaluate depreciation rates each time we file with the FERC for a change in our transportation and storage service rates.

      When we retire property, plant and equipment, we charge accumulated depreciation and amortization for the original cost, plus the cost to remove, sell or dispose, less its salvage value. We do not recognize a gain or loss unless we sell an entire operating unit. We include gains or losses on dispositions of operating units in income.

      At December 31, 2004 and 2003, we had approximately $129 million and $81 million of construction work in progress included in our property, plant and equipment.

      We capitalize a carrying cost or AFUDC on funds invested in our construction of long-lived assets. This carrying cost consists of a return on the investment financed by debt and a return on the investment financed by equity. The debt portion is calculated based on our average cost of debt. Debt amounts capitalized during the years ended December 31, 2004, 2003 and 2002, were $3 million, $3 million and $2 million. These amounts are included as a reduction to interest expense in our income statement. The equity portion is calculated using the most recent FERC approved equity rate of return. The equity amounts capitalized during the years ended December 31, 2004, 2003 and 2002 were $6 million, $7 million and $5 million (exclusive of any tax related impacts). These amounts are included as other non-operating income on our income statement. Capitalized carrying costs for debt and equity financed construction are reflected as an increase in the cost of the asset on our balance sheet.

  Asset and Investment Impairments

      We apply the provisions of SFAS No. 144, Accounting for the Impairment or Disposal of Long-Lived Assets and Accounting Principles Board Opinion No. 18, The Equity Method of Accounting for Investments in Common Stock, to account for asset and investment impairments. Under these standards, we evaluate an asset

or investment for impairment when events or circumstances indicate that its carrying value may not be recovered. These events include market declines that are believed to be other than temporary, changes in the manner in which we intend to use a long-lived asset, decisions to sell an asset and adverse changes in the legal or business environment such as adverse actions by regulators. When an event occurs, we evaluate the recoverability of our carrying value based on either (i) the long-lived asset’s ability to generate future cash flows on an undiscounted basis or (ii) the fair value of our investment in unconsolidated affiliates. If an impairment is indicated or if we decide to exit or sell a long-lived asset or group of assets, we adjust the carrying value of these assets downward, if necessary, to their estimated fair value, less costs to sell. Our fair value estimates are generally based on market data obtained through the sales process or an analysis of expected discounted cash flows. The magnitude of any impairment is impacted by a number of factors, including the nature of the assets to be sold and our established time frame for completing the sales, among other factors.

  Revenue Recognition

      Our revenues are generated from transportation and storage services and operational sales of natural gas. For our transportation and storage services, we recognize reservation revenues on firm contracted capacity over the contract period regardless of the amount of natural gas that is transported or stored. For interruptible or volumetric based transportation services, as well as revenues on operational sales of natural gas and related products, we record revenues when physical deliveries of natural gas and other commodities are made at the agreed upon delivery point or when gas is injected or withdrawn from the storage facility. Revenues for all services are generally based on the thermal quantity of gas delivered or subscribed at a price specified in the contract. We are subject to FERC regulations and, as a result, revenues we collect may possibly be refunded in a final order of a pending rate proceeding or as a result of a rate settlement. We establish reserves for these potential refunds.

  Price Risk Management Activities

      Our equity investee, Citrus, uses derivatives to mitigate, or hedge, cash flow risk associated with its variable interest rates on long-term debt. Citrus accounts for these derivatives under the provisions of SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, and records changes in the fair value of these derivatives in other comprehensive income. We reflect our proportionate share of the impact these derivative instruments have on Citrus’ financial statements as adjustments to our other comprehensive income and our investment in unconsolidated affiliates.

  Environmental Costs and Other Contingencies

      We record environmental liabilities when our environmental assessments indicate that remediation efforts are probable, and the costs can be reasonably estimated. We recognize a current period expense for the liability when the clean-up efforts do not benefit future periods. We capitalize costs that benefit more than one accounting period, except in instances where separate agreements or legal and regulatory guidelines dictate otherwise. Estimates of our liabilities are based on currently available facts, existing technology and presently enacted laws and regulations taking into account the likely effects of inflation and other societal and economic factors, and include estimates of associated legal costs. These amounts also consider prior experience in remediating contaminated sites, other companies’ clean-up experience and data released by the Environmental Protection Agency (EPA) or other organizations. These estimates are subject to revision in future periods based on actual costs or new circumstances and are included in our balance sheet in other current and long-term liabilities at their undiscounted amounts. We evaluate recoveries from insurance coverage, rate recovery, government sponsored and other programs separately from our liability and, when recovery is assured, we record and report an asset separately from the associated liability in our financial statements.

      We recognize liabilities for other contingencies when we have an exposure that, when fully analyzed, indicates it is both probable that an asset has been impaired or that a liability has been incurred and the amount of impairment or loss can be reasonably estimated. Funds spent to remedy these contingencies are

charged against a reserve, if one exists, or expensed. When a range of probable loss can be estimated, we accrue the most likely amount or at least the minimum of the range of probable loss.

  Income Taxes

      El Paso maintains a tax accrual policy to record both regular and alternative minimum taxes for companies included in its consolidated federal and state income tax returns. The policy provides, among other things, that (i) each company in a taxable income position will accrue a current expense equivalent to its federal and state income taxes, and (ii) each company in a tax loss position will accrue a benefit to the extent its deductions, including general business credits, can be utilized in the consolidated returns. El Paso pays all consolidated U.S. federal and state income taxes directly to the appropriate taxing jurisdictions and, under a separate tax billing agreement, El Paso may bill or refund its subsidiaries for their portion of these income tax payments.

      Pursuant to El Paso’s policy, we report current income taxes based on our taxable income and we provide for deferred income taxes to reflect estimated future tax payments or receipts. Deferred taxes represent the tax impacts of differences between the financial statement and tax bases of assets and liabilities and carryovers at each year end. We account for tax credits under the flow-through method, which reduces the provision for income taxes in the year the tax credits first become available. We reduce deferred tax assets by a valuation allowance when, based on our estimates, it is more likely than not that a portion of those assets will not be realized in a future period. The estimates utilized in the recognition of deferred tax assets are subject to revision, either up or down, in future periods based on new facts or circumstances.

2. Income Taxes

      The following table reflects the components of income taxes included in net income for each of the three years ended December 31:

      Our income taxes differ from the amount computed by applying the statutory federal income tax rate of 35 percent for the following reasons for each of the three years ended December 31:

      The following are the components of our net deferred tax liability at December 31:

      Under El Paso’s tax accrual policy, we are allocated the tax effects associated with our employees’ non-qualified dispositions of employee stock purchase plan stock, the exercise of non-qualified stock options and the vesting of restricted stock as well as restricted stock dividends. This allocation did not have a material effect in 2004; however, it increased taxes payable by $1 million in 2003 and reduced taxes payable by $1 million in 2002. These tax effects are included in additional paid-in capital in our balance sheet.

      The following are the components of our carryovers as of December 31, 2004:

     Usage of these carryovers is subject to the limitations provided under Sections 382 and 383 of the Internal Revenue Code as well as the separate return limitation year rules of IRS regulations. We have recorded a valuation allowance to reserve for the deferred taxes related to our general business credits.

3. Financial Instruments

      The carrying amounts and estimated fair values of our financial instruments are as follows at December 31:

     At December 31, 2004 and 2003, the carrying amounts of cash and cash equivalents, short-term borrowings, and trade receivables and payables are representative of fair value because of the short-term maturity of these instruments.

4. Regulatory Assets and Liabilities

      Below are the details of our regulatory assets and liabilities at December 31:

5. Accounting for Hedging Activities

      As of December 31, 2004 and 2003, our equity interest in the value of Citrus’ cash flow hedges included in accumulated other comprehensive loss was an unrealized loss of $8 million, net of income taxes. This amount will be reclassified to earnings over the terms of Citrus’ outstanding debt. We estimate that less than $1 million of this unrealized loss will be reclassified from accumulated other comprehensive loss over the next twelve months. For the years ended December 31, 2004, 2003 and 2002, no ineffectiveness was recorded in earnings on these cash flow hedges.

6. Debt and Other Credit Facilities

      Our long-term debt outstanding consisted of the following at December 31:

      Aggregate maturities of the principal amounts of long-term debt for the next 5 years and in total thereafter are as follows:

      In March 2003, we issued $400 million of unsecured senior notes with an annual interest rate of 8.875%. The notes mature in 2010. Net proceeds were used to pay a cash dividend to our parent of approximately $290 million, while the remaining proceeds were used for capital expenditures in 2003.

  Credit Facilities

      In November 2004, El Paso replaced its previous $3 billion revolving credit facility with a new $3 billion credit agreement with a group of lenders. The credit agreement consists of a $1.25 billion term loan facility, a $750 million letter of credit facility, and a $1 billion revolving credit facility. The letter of credit facility provides El Paso the ability to issue letters of credit or borrow any unused capacity as revolving loans. At December 31, 2004, El Paso had $1.25 billion outstanding under the term loan facility and utilized approximately all of the $750 million letter of credit facility and approximately $0.4 billion of the $1 billion revolving credit facility to issue letters of credit. We are not a borrower under El Paso’s credit agreement; however, El Paso’s interest in our subsidiary, Southern Gas Storage Company, as well as our interest in Bear Creek, are pledged as collateral under the new credit agreement.

      Under our indentures, we are subject to a number of restrictions and covenants. The most restrictive of these include (i) limitations on the incurrence of additional debt, based on a ratio of debt to EBITDA (as defined in the agreements), the most restrictive of which shall not exceed 6 to 1; (ii) limitations on the use of proceeds from borrowings; (iii) limitations, in some cases, on transactions with our affiliates; (iv) limitations on the incurrence of liens; (v) potential limitations on our ability to declare and pay dividends; and (vi) potential limitations on our ability to participate in El Paso’s cash management program discussed in Note 11. For the year ended December 31, 2004, we were in compliance with all of our debt-related covenants.

7. Commitments and Contingencies

  Legal Proceedings

      Grynberg. In 1997, we and a number of our affiliates were named defendants in actions brought by Jack Grynberg on behalf of the U.S. Government under the False Claims Act. Generally, these complaints allege an industry-wide conspiracy to underreport the heating value as well as the volumes of the natural gas produced from federal and Native American lands, which deprived the U.S. Government of royalties. The plaintiff in this case seeks royalties that he contends the government should have received had the volume and heating value been differently measured, analyzed, calculated and reported, together with interest, treble damages, civil penalties, expenses and future injunctive relief to require the defendants to adopt allegedly appropriate gas measurement practices. No monetary relief has been specified in this case. These matters have been consolidated for pretrial purposes (In re: Natural Gas Royalties Qui Tam Litigation, U.S. District Court for the District of Wyoming, filed June 1997). Motions to dismiss have been filed on behalf of all defendants. Our costs and legal exposure related to these lawsuits and claims are not currently determinable.

      Royalty Claim. In five contract settlements reached in the late 1980s with Elf Aquitaine (Elf) pertaining to the pricing of gas produced from certain federal offshore blocks, we indemnified Elf against royalty claims that potentially could have been asserted by the Minerals Management Service (MMS). Following its settlements with us, Elf received demands from MMS for royalty payments related to the settlements. With our approval, Elf protested the demands for over a decade while trying to reach a settlement with the MMS. Elf, which is now TOTAL E&P USA (TOTAL), advised us that it had renewed efforts to settle claims by the MMS for excess royalties attributable to price reductions that we achieved in the gas contract settlements in the late 1980s. TOTAL informed us that the MMS is claiming in excess of $13 million in royalties, a large portion of which is interest, for the five settlements with us. We have advised TOTAL that not all of the amounts being sought by the MMS are covered by our indemnity. If TOTAL cannot resolve these claims administratively with MMS, then an appeal can be taken to the federal courts. We have the right under a pre-existing settlement with our customers to recover through a surcharge payable by our customers a portion of the amount ultimately paid under the royalty indemnity with TOTAL.

      In addition to the above matters, we and our subsidiaries and affiliates are named defendants in numerous lawsuits and governmental proceedings that arise in the ordinary course of our business.

      For each of our outstanding legal matters, we evaluate the merits of the case, our exposure to the matter, possible legal or settlement strategies and the likelihood of an unfavorable outcome. If we determine that an unfavorable outcome is probable and can be estimated, we establish the necessary accruals. As this information becomes available, or other relevant developments occur, we will adjust our accrual amounts accordingly. While there are still uncertainties related to the ultimate costs we may incur, based upon our evaluation and experience to date, we believe our current reserves are adequate. At December 31, 2004, we had accrued approximately $2 million for our outstanding legal matters.

  Environmental Matters

      We are subject to federal, state and local laws and regulations governing environmental quality and pollution control. These laws and regulations require us to remove or remedy the effect on the environment of the disposal or release of specified substances at current and former operating sites. At December 31, 2004, we had accrued less than $1 million for expected remediation costs and associated onsite, offsite and groundwater technical studies, which we anticipate incurring through 2027. Our accrual was based on the most likely outcome that can be reasonably estimated. Below is a reconciliation of our accrued liability at December 31, 2004 (in millions):

      In addition, we expect to make capital expenditures for environmental matters of approximately $4 million in the aggregate for the years 2005 through 2009. These expenditures primarily relate to compliance with clean air regulations. For 2005, we estimate that our total remediation expenditures will be less than $1 million, which will be expended under government directed clean-up plans.

      It is possible that new information or future developments could require us to reassess our potential exposure related to environmental matters. We may incur significant costs and liabilities in order to comply with existing environmental laws and regulations. It is also possible that other developments, such as increasingly strict environmental laws and regulations and claims for damages to property, employees, other persons and the environment resulting from our current or past operations, could result in substantial costs and liabilities in the future. As this information becomes available, or other relevant developments occur, we will adjust our accrual amounts accordingly. While there are still uncertainties relating to the ultimate costs we may incur, based upon our evaluation and experience to date, we believe our reserves are adequate.

     Rates and Regulatory Matters

      Rate Case. In August 2004, we filed a rate case with the FERC seeking an annual rate increase of $35 million, or 11 percent in jurisdictional rates, no changes to cost allocation, rate design or current fuel retention percentage, and certain revisions to our effective tariff regarding terms and conditions of service. In September 2004, the FERC issued a suspension order accepting certain proposed tariff revisions, including the elimination of right of first refusal matching term limitations, changes in the imbalance cash-out price calculations, and permitting formularized discounting as a non-material deviation. These revisions became effective in October 2004. The order established a technical conference to assess other proposed tariff revisions, including notice to exercise public service commission (PSC) outs, restrictions on firm receipt point amendments, the application of the storage reconciliation mechanism surcharge (SCRM) to additional services on our system, and the change in cash-out pricing for imbalances of less than 2 percent. The FERC established a hearing, which is scheduled for July 2005, on our proposed rate increase, to become effective in March 2005, subject to refund and conditions. On December 9, 2004, the FERC staff convened a technical

conference on tariff issues not set for hearing. On February 28, 2005, the FERC issued an order on Technical Conference and Rehearing accepting all tariff changes proposed by us in our rate filing except for one proposal governing changes to receipt points under existing service agreements, which was set for hearing. We have reached a tentative settlement in principle that will resolve all issues in our rate proceeding.

      Rate Investigation. In December 2004, SLNG filed a cost and revenue study with the FERC, in compliance with existing certificate authorization, to justify its existing rates for terminaling service at its LNG marine receiving terminal at Elba Island. In February 2005, the FERC set the cost and revenue study for hearing under Section 5 of the Natural Gas Act to determine if the current rates remain just and reasonable.

      Accounting for Pipeline Integrity Costs. In November 2004, the FERC issued a proposed accounting release that may impact certain costs we incur related to our pipeline integrity program. If the release is enacted as written, we would be required to expense certain future pipeline integrity costs instead of capitalizing them as part of our property, plant and equipment. Although we continue to evaluate the impact that this potential accounting release will have on our consolidated financial statements, we currently estimate that we would be required to expense an additional amount of pipeline integrity expenditures in the range of approximately $5 million to $7 million annually over the next eight years.

      Inquiry Regarding Income Tax Allowances. In December 2004, the FERC issued a Notice of Inquiry (NOI) in response to a recent D.C. Circuit decision that held the FERC had not adequately justified its policy of providing a certain oil pipeline limited partnership with an income tax allowance equal to the proportion of its limited partnership interests owned by corporate partners. The FERC sought comments on whether the court’s reasoning should be applied to other partnerships or other ownership structures. We own interests in non-taxable entities that could be affected by this ruling. We cannot predict what impact this inquiry will have on our interstate pipelines.

      Selective Discounting Notice of Inquiry. In November 2004, the FERC issued a NOI seeking comments on its policy regarding selective discounting by natural gas pipelines. The FERC seeks comments regarding whether its practice of permitting pipelines to adjust their ratemaking throughput downward in rate cases to reflect discounts given by pipelines for competitive reasons is appropriate when the discount is given to meet competition from another natural gas pipeline. We, along with several of our affiliated pipelines, filed comments on the NOI in March 2005. The final outcome of this inquiry cannot be predicted with certainty, nor can we predict the impact that the final rule will have on us.

      While the outcome of our outstanding rates and regulatory matters cannot be predicted with certainty, based on current information, we do not expect the ultimate resolution of these matters to have a material adverse effect on our financial position, operating results or cash flows. However, it is possible that new information or future developments could require us to reassess our potential exposure related to these matters.

      Atlanta Gas Light. The majority of our contracts for firm transportation service with our largest customer, Atlanta Gas Light Company (AGL), were due to expire in 2005. In April 2004, we and AGL executed definitive agreements pursuant to which AGL agreed to extend its firm transportation service contracts with us for 926,534 Mcf/d for a weighted average term of 6.5 years between 2008 and 2015 in exchange for the sale by us to AGL of approximately 250 miles of certain pipeline facilities and nine measurement facilities in the metropolitan Atlanta area at a transfer price now estimated at approximately $31 million. Such agreements to implement the transactions (Triangle Project) were made subject to approvals by the FERC and the Georgia Public Service Commission (GPSC). The FERC and GPSC issued orders generally approving the Triangle Project on January 25, 2005 and November 2, 2004, respectively. Closing of the transaction was held on March 1, 2005, and construction of the 6.36 miles of pipeline to close the gap between the two segments on our 30-inch Ocmulgee-Atlanta Line is scheduled to begin in March 2005.

      Duke Litigation. CTC, a direct subsidiary of Citrus, has filed suit against Duke Energy LNG Sales, Inc (Duke) and PanEnergy Corp., the holding company of Duke, seeking damages of $185 million for breach of a gas supply contract and wrongful termination of that contract. Duke sent CTC notice of termination of the gas supply contract alleging failure of CTC to increase the amount of an outstanding letter of credit as collateral for its purchase obligations. Duke has filed in federal court an amended counter claim joining Citrus and a cross motion for partial summary judgment, requesting that the court find that Duke had a right to terminate its gas sales contract with CTC due to the failure of CTC to adjust the amount of the letter of credit supporting its purchase obligations. CTC filed an answer to Duke’s motion, which is currently pending before the court. An adverse outcome on these matters could impact our investment in Citrus. We do not expect the ultimate resolution of this matter to have a material adverse effect on us.

      While the outcome of these matters cannot be predicted with certainty, based on current information and our existing accruals, we do not expect the ultimate resolution of these matters to have a material adverse effect on our financial position, operating results or cash flows. However, it is possible that new information or future developments could require us to reassess our potential exposure related to these matters, and adjust our accruals accordingly. The impact of these changes may have a material effect on our results of operations, our financial position, and our cash flows in the periods these events occur.

     Capital Commitments and Purchase Obligations

      At December 31, 2004, we had capital and investment commitments of $73 million primarily relating to the expansion of our Elba Island facility. Our other planned capital and investment projects are discretionary in nature, with no substantial contractual capital commitments made in advance of the actual expenditures. In addition, we have entered into unconditional purchase obligations for products and services totaling $34 million at December 31, 2004. Our annual obligations under these agreements are $19 million for 2005, $11 million for 2006, $1 million for 2007, $2 million for 2008 and $1 million for 2009.

     Operating Leases

      We lease property, facilities and equipment under various operating leases. The majority of our total commitments on operating leases is the lease of the AmSouth Center located in Birmingham, Alabama. El Paso guarantees all obligations under this lease agreement. Minimum future annual rental commitments on our operating leases as of December 31, 2004, were as follows:

      Rental expense on our operating leases for each of the years ended December 31, 2004, 2003, and 2002 was $3 million, $3 million and $4 million.

8. Retirement Benefits

     Pension and Retirement Benefits

      El Paso maintains a pension plan to provide benefits determined under a cash balance formula covering substantially all of its U.S. employees, including our employees. Prior to January 1, 2000, Sonat Inc., our former parent company, maintained a pension plan for our employees. On January 1, 2000, the Sonat pension plan was merged into El Paso’s cash balance plan. Our employees who were active participants in the Sonat pension plan on December 31, 1999, receive the greater of cash balance benefits under the El Paso plan or Sonat plan benefits accrued through December 31, 2004.

      El Paso also maintains a defined contribution plan covering its U.S. employees, including our employees. Prior to May 1, 2002, El Paso matched 75 percent of participant basic contributions up to 6 percent, with the matching contributions being made to the plan’s stock fund, which participants could diversify at any time. After May 1, 2002, the plan was amended to allow for company matching contributions to be invested in the same manner as that of participant contributions. Effective March 1, 2003, El Paso suspended the matching contributions, but reinstituted it again at a rate of 50 percent of participant basic contributions up to 6 percent on July 1, 2003. Effective July 1, 2004, El Paso increased the matching contributions to 75 percent of participant basic contributions up to 6 percent. El Paso is responsible for benefits accrued under its plans and allocates the related costs to its affiliates.

      As a result of our merger with El Paso in October 1999, we offered a one-time election through an early retirement window for Sonat employees who were at least age 50 with 10 years of service on December 31, 1999, to retire on or before June 30, 2000, and keep benefits under Sonat’s past retirement medical and life plans. Medical benefits for this closed group of retirees may be subject to deductibles, co-payment provisions, and other limitations and dollar caps on the amount of employer costs. El Paso reserves the right to change these benefits. Employees who retire after June 30, 2000, continue to receive limited postretirement life insurance benefits. Our postretirement benefit plan costs are prefunded to the extent these costs are recoverable through our rates. We expect to contribute $4 million to our other postretirement benefit plan in 2005.

      In 2004, we adopted FASB Staff Position (FSP) No. 106-2, Accounting and Disclosure Requirements Related to the Medicare Prescription Drug, Improvement and Modernization Act of 2003. This pronouncement required us to record the impact of the Medicare Prescription Drug, Improvement and Modernization Act of 2003 on our postretirement benefit plans that provide drug benefits that are covered by that legislation. The adoption of FSP No. 106-2 decreased our accumulated postretirement benefit obligation by $17 million, which is deferred as an actuarial gain in our postretirement benefit liabilities as of December 31, 2004. We expect that the adoption of this guidance will reduce our postretirement benefit expense by approximately $2 million in 2005.

      The following table presents the change in projected benefit obligation, change in plan assets and reconciliation of funded status for our other postretirement benefit plan. Our benefits are presented and computed as of and for the twelve months ended September 30 (the plan reporting date):

      Future benefits expected to be paid on our other postretirement plan as of December 31, 2004, are as follows (in millions):

      Our postretirement benefit costs recorded in operating expenses include the following components for the years ended December 31:

      Projected benefit obligations and net benefit costs are based on actuarial estimates and assumptions. The following table details the weighted average actuarial assumptions used for our other postretirement plan for 2004, 2003 and 2002:

     Actuarial estimates for our postretirement benefits plan assumed a weighted average annual rate of increase in the per capita costs of covered health care benefits of 10.0 percent in 2004, gradually decreasing to 5.5 percent by the year 2009. Assumed health care cost trends can have a significant effect on the amounts reported for other postretirement benefit plan. A one-percentage point change in our assumed health care cost trends would have the following effects as of September 30:

      Other Postretirement Plan Assets

      The following table provides the actual asset allocations in our postretirement plan as of September 30:

      The primary investment objective of our plan is to ensure, that over the long-term life of the plan, an adequate pool of sufficiently liquid assets exists to support the benefit obligation to participants, retirees and beneficiaries. In meeting this objective, the plan seeks to achieve a high level of investment return consistent with a prudent level of portfolio risk. Investment objectives are long-term in nature covering typical market cycles of three to five years. Any shortfall in investment performance compared to investment objectives is the result of general economic and capital market conditions.

      The target allocation for the invested assets is 65 percent equity and 35 percent fixed income. In 2003, we modified our target asset allocations for our postretirement benefit plan to increase our equity allocation to 65 percent of total plan assets. Other assets are held in cash for payment of benefits upon presentment. Any El Paso stock held by the plan is held indirectly through investments in mutual funds.

9. Transactions with Major Customers

      The following table shows revenues from major customers for each of the three years ended December 31:

10. Supplemental Cash Flow Information

      The following table contains supplemental cash flow information for each of the three years ended December 31:

11. Investments in Unconsolidated Affiliates and Transactions with Affiliates

  Investments in Unconsolidated Affiliates

      Our investments in unconsolidated affiliates are accounted for using the equity method of accounting and consist of our equity ownership interests in Citrus and Bear Creek.

      Citrus. In March 2003, El Paso contributed its 50 percent ownership interest in Citrus to us. Citrus owns and operates Florida Gas Transmission, a 4,870 mile regulated pipeline system that extends from producing regions in Texas to markets in Florida. Since both the investment in Citrus, which is accounted for as an equity investment, and our common stock were owned by El Paso at the time of the contribution, we were required to reflect the investment in Citrus at its historical cost and include its operating results in our financial statements for all periods presented prior to its contribution.

      CrossCountry owns the other 50 percent of Citrus, which was previously owned by Enron Corp. (Enron). Effective in April 2004, Enron assigned its capital stock in Citrus to CrossCountry. In September 2004, Enron sold its interest in CrossCountry to a joint venture between Southern Union and General Electric. The ownership agreements of Citrus provide each partner with a right of first refusal to purchase the ownership interest of the other partner. Our investment in Citrus is limited to our ownership of the voting stock of Citrus, and we have no financial obligations, commitments or guarantees, either written or oral, to support Citrus.

      During the fourth quarter of 2004, we received $70 million of dividends from Citrus. At December 31, 2004 and 2003, our investment in Citrus was $589 million and $593 million.

      Bear Creek. Through our subsidiary, Southern Gas Storage Company, we hold a 50 percent ownership interest in Bear Creek, a joint venture with TSC, our affiliate. Bear Creek owns and operates an underground natural gas storage facility located in Louisiana. The facility has a capacity of 50 Bcf of base gas and 58 Bcf of working storage. Bear Creek’s working storage capacity is committed equally to the TGP system (an affiliated system), and our pipeline system under long-term contracts. Our investment in Bear Creek at December 31, 2004 and 2003, was $151 million and $138 million.

      Summarized financial information of our proportionate share of our unconsolidated affiliates are presented below:

     Transactions with Affiliates

      Cash Management Program. We participate in El Paso’s cash management program which matches short-term cash surpluses and needs of participating affiliates, thus minimizing total borrowings from outside sources. At December 31, 2004 and 2003, we had advanced to El Paso $171 million and $153 million. The interest rate at December 31, 2004 and 2003 was 2.0% and 2.8%. These receivables are due upon demand; however, at December 31, 2004 and 2003, we have classified these advances as non-current notes receivable from affiliates because we do not anticipate settlement within the next twelve months.

      Affiliate Payables. We had accounts payable to affiliates of $8 million at December 31, 2004 and 2003. These balances arose in the normal course of business.

      We also received $1 million and $10 million in deposits related to our transportation contracts with El Paso Marketing L.P. (formerly El Paso Merchant Energy L.P.), which are included in our balance sheet as current liabilities as of December 31, 2004 and 2003.

      We are a party to a tax accrual policy with El Paso whereby El Paso files U.S. and certain state tax returns on our behalf. In certain states, we file and pay directly to the state taxing authorities. We have income taxes payable of $46 million at December 31, 2004 and 2003, included in taxes payable on our balance sheets. The majority of these balances will become payable to El Paso under the tax accrual policy. See Note 1 for a discussion of our tax accrual policy.

      Other. In 2004, we acquired assets from our affiliates with a net book value of $4 million.

      In March 2003, we declared and paid a $600 million dividend, $310 million of which was a non-cash distribution of affiliated receivables and $290 million of which was cash.

      Affiliate Revenues and Expenses. El Paso allocates a portion of their general and administrative expenses to us. The allocation of expenses is based upon the estimated level of effort devoted to our operations and the relative size of our EBIT, gross property and payroll. For the years ended December 31, 2004, 2003

and 2002, the annual charges were $38 million, $42 million and $41 million. During 2004, 2003 and 2002, TGP allocated payroll and other expenses associated with shared pipeline services to us. The allocated expenses are based on the estimated level of staff and their expenses to provide these services. For the years ended December 31, 2004, 2003 and 2002, the annual charges were $11 million, $8 million and $5 million. We believe that the allocation methods are reasonable.

      The following table shows revenues and charges from our affiliates for each of the three years ended December 31: