Exhibit 99.1

News Release

Analysts and Media Contact:

Susan Giles (972) 855-3729

Atmos Energy Corporation Reports Earnings for the Fiscal 2009 First Quarter;

Company Affirms Fiscal 2009 Guidance

DALLAS (February 3, 2009)—Atmos Energy Corporation (NYSE: ATO) today reported consolidated results for its fiscal 2009 first quarter ended December 31, 2008.

“Results for the first quarter of fiscal 2009 are both strong and encouraging,” said Robert W. Best, chairman and chief executive officer of Atmos Energy Corporation. “Our regulated gas distribution business experienced a 25 percent increase in net income from a year ago due to improvements in rate design and execution of our regulatory strategy. As anticipated, our nonregulated marketing business experienced margin growth from cycling storage gas to meet winter demand and realizing the associated economic value captured last year. Additionally, we are gratified that our efforts to strengthen the balance sheet have been recognized, as evidenced by the recent positive changes to our corporate credit ratings. We remain confident that Atmos Energy is on track to meet our goal of growing annual earnings in the 4 to 6 percent range, on average.”

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Natural gas distribution gross profit increased $25.2 million to $298.4 million for the fiscal 2009 first quarter, compared with $273.2 million in the prior-year quarter, before intersegment eliminations. This increase reflects a net $15.3 million increase in rates primarily in the Mid-Tex and Louisiana divisions, a six percent increase in throughput and increased transportation margins associated with higher transportation rates and throughput. Additionally, gross profit increased $8.1 million due to a non-recurring update to the estimate for gas delivered to customers but not yet billed, resulting from base rate changes in several jurisdictions.

Regulated transmission and storage gross profit increased $9.7 million to $54.7 million for the three months ended December 31, 2008, compared with $45.0 million for the three months ended December 31, 2007, before intersegment eliminations. The increase reflects significantly higher priority reservation fees and per-unit margins earned from through-system deliveries, increased city-gate deliveries to the Mid-Tex Division and increased revenues resulting from filings under the Texas Gas Reliability Infrastructure Program (GRIP).

Natural gas marketing gross profit decreased $16.0 million to $30.0 million for the fiscal 2009 first quarter, compared with $46.0 million for the fiscal 2008 first quarter, before intersegment eliminations. This decrease primarily reflects a $53.8 million reduction in unrealized margins quarter over quarter. Storage and trading margins increased $37.5 million compared with the prior-year quarter, primarily due to the recognition by Atmos Energy Marketing (AEM) of storage withdrawal gains captured during fiscal 2008, as a result of deferring storage withdrawals and rolling the associated financial instruments to forward months.

Pipeline, storage and other gross profit increased $6.5 million to $12.5 million for the three months ended December 31, 2008, compared with $6.0 million for the three months ended December 31, 2007, before intersegment eliminations. The increase primarily reflects higher transportation margins earned under asset optimization agreements.

Consolidated operation and maintenance expense for the first quarter of fiscal 2009 was $134.8 million, compared with $121.2 million for the first quarter last year. Excluding the provision for doubtful accounts, operation and maintenance expense for the current quarter increased $14.9 million compared with the prior-year quarter. The increase primarily results from higher employee wages and benefits costs and higher pipeline maintenance costs.

The provision for doubtful accounts was $3.3 million for the three months ended December 31, 2008, compared with $4.6 million for three months ended December 31, 2007. The $1.3 million decrease primarily results from the Mid-Tex Division’s ability to recover the gas cost portion of bad debts through the Rate Review Mechanism (RRM), which became effective November 1, 2008. In the natural gas distribution segment, the average cost of natural gas for the three months ended December 31, 2008, was $8.28 per thousand cubic feet (Mcf), compared with $7.73 per Mcf for the same quarter last year.

Interest charges for the three months ended December 31, 2008 were $39.0 million, compared with $36.8 million for the three months ended December 31, 2007. The $2.2 million quarter-over-quarter increase reflects higher commercial paper rates, increased line of credit commitment fees and higher average short-term debt balances experienced during the current-year quarter, compared with the prior-year quarter.

The capitalization ratio at December 31, 2008, was 54.4 percent, compared with 54.6 percent at September 30, 2008, and 53.4 percent at December 31, 2007. The current portion of long-term debt includes the Company’s $400 million 4.00% unsecured senior notes, which will mature in October 2009. Short-term debt was $360.8 million at December 31, 2008, compared to $350.5 million at September 30, 2008, and $202.2 million at December 31, 2007.

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For the three months ended December 31, 2008, operating activities provided cash of $150.7 million, compared with $61.4 million for the three months ended December 31, 2007. Quarter over quarter, the increase in operating cash flow primarily reflects favorable working capital changes associated with the company’s accounts receivable and natural gas inventories.

Capital expenditures increased to $107.4 million for the current quarter, compared with $94.2 million for the same period last year. The $13.2 million increase primarily reflects spending for a nonregulated growth project and regulatory compliance spending in the Mid-Tex Division.

Outlook

The leadership of Atmos Energy remains focused on enhancing shareholder value by delivering consistent earnings growth. Atmos Energy continues to project fiscal 2009 earnings to be in the range of $2.05 to $2.15 per diluted share, excluding any material mark-to-market impact. Major assumptions underlying the earnings projection remain unchanged. Capital expenditures for fiscal 2009 are expected to range from $500 million to $515 million.

However, the mark-to-market impact on the nonregulated marketing company’s physical storage inventory at September 30, 2009, and changes in events or other circumstances that the company cannot currently anticipate or predict, including adverse credit market conditions, could result in earnings for fiscal 2009 that are significantly above or below this outlook. Factors that could cause such changes are described below in Forward-Looking Statements and in other company documents on file with the Securities and Exchange Commission.

Atmos Energy continues to experience marked improvement in the cost and access to the commercial paper market and believes it has sufficient liquidity to support its operating and capital spending plans. Amounts available to the company under existing and new credit facilities coupled with operating cash flow should provide the necessary liquidity to fund the company’s common stock dividend, working capital needs and capital expenditures for fiscal 2009. Further, the company is evaluating alternatives to refinance its $400 million 4.00% unsecured senior notes maturing in October 2009.

Conference Call to be Webcast February 4, 2009

Atmos Energy will host a conference call with financial analysts to discuss the financial results for the fiscal 2009 first quarter on Wednesday, February 4, 2009, at 8 a.m. EST. The telephone number is 800-218-0204. The conference call will be webcast live on the Atmos Energy Web site at www.atmosenergy.com . A slide presentation and a playback of the call will be available on the Web site later that day. Atmos Energy senior leadership who will participate in the conference call include: Bob Best, chairman and chief executive officer; Kim Cocklin, president and chief operating officer; Fred Meisenheimer, vice president, interim chief financial officer and controller; and Mark Johnson, senior vice president, nonregulated operations.

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Other Highlights and Recent Developments

$375 Million Committed Revolving Credit Facility

On December 30, 2008, Atmos Energy Marketing, LLC (AEM), amended its existing $580 million uncommitted demand working capital credit facility to convert it to a 364-day, $375 million committed revolving credit facility. The amended credit facility also provides the ability to increase the borrowing base up to a maximum of $450. The amended credit facility will expire on December 29, 2009.

Credit Ratings Upgraded

On December 23, 2008, Standard and Poor’s Ratings Services (S&P) raised its corporate credit rating on Atmos Energy Corporation from BBB to BBB+ and said the outlook for the company is “Stable”.

On January 8, 2009, Moody’s Investors Service changed Atmos Energy Corporation’s rating outlook to “Positive” from “Stable” and affirmed the company’s ratings at Baa3.

Executive Officer Changes

On December 2, 2008, Atmos Energy announced the resignation of Pat Reddy, senior vice president and chief financial officer, effective December 31, 2008. Fred Meisenheimer, vice president and controller, has been appointed by the board of directors to serve as interim chief financial officer, effective January 1, 2009, until a successor is appointed.

On December 1, 2008, Charles M. Davis, Jr. was named as vice president, corporate development. Mr. Davis will be working with Atmos Energy’s senior management to develop and implement a strategy to identify and evaluate internal and external growth opportunities. He reports to Kim R. Cocklin, president and chief operating officer of Atmos Energy.

This news release should be read in conjunction with the attached unaudited financial information.

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Forward-Looking Statements

The matters discussed in this news release may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical fact included in this news release are forward-looking statements made in good faith by the company and are intended to qualify for the safe harbor from liability established by the Private Securities Litigation Reform Act of 1995. When used in this news release or in any of the company’s other documents or oral presentations, the words “anticipate,” “believe,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “objective,” “plan,” “projection,” “seek,” “strategy” or similar words are intended to identify forward-looking statements. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those discussed in this news release, including the risks and uncertainties relating to regulatory trends and decisions, the company’s ability to continue to access the capital markets and the other factors discussed in the company’s filings with the Securities and Exchange Commission. These factors include the risks and uncertainties discussed in the company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2008. Although the company believes these forward-looking statements to be reasonable, there can be no assurance that they will approximate actual experience or that the expectations derived from them will be realized. The company undertakes no obligation to update or revise forward-looking statements, whether as a result of new information, future events or otherwise.

About Atmos Energy

Atmos Energy Corporation, headquartered in Dallas, is the country’s largest natural-gas-only distributor, serving about 3.2 million natural gas distribution customers in more than 1,600 communities in 12 states from the Blue Ridge Mountains in the East to the Rocky Mountains in the West. Atmos Energy also provides natural gas marketing and procurement services to industrial, commercial and municipal customers primarily in the Midwest and Southeast and manages company-owned natural gas pipeline and storage assets, including one of the largest intrastate natural gas pipeline systems in Texas. Atmos Energy is a Fortune 500 company. For more information, visit www.atmosenergy.com .

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