Exhibit 99.1

News Release

Analysts and Media Contact:

Susan Giles (972) 855-3729

Atmos Energy Corporation Reports Earnings for the

Fiscal 2008 Third Quarter and Nine Months; Reaffirms Fiscal 2008 Guidance

DALLAS (August 5, 2008)—Atmos Energy Corporation (NYSE: ATO) today reported consolidated results for its fiscal 2008 third quarter and nine months ended June 30, 2008.

For the nine months ended June 30, 2008, net income was $178.7 million, or $1.99 per diluted share, compared with net income of $174.4 million, or $2.00 per diluted share for the same period last year. Diluted earnings per share for the current nine-month period fully reflect the effect of a 3.4 percent increase in weighted average diluted shares outstanding, primarily associated with the company’s December 2006 equity offering. For the current nine-month period, the regulated operations contributed $148.8 million of net income, or $1.66 per diluted share, and the nonregulated operations contributed $29.9 million of net income, or $0.33 per diluted share.

“Because of the seasonal nature of our natural gas distribution operations, the third quarter of the fiscal year is typically a loss quarter” said Robert W. Best, chairman, president and chief executive officer of Atmos Energy Corporation. “However, compared to last year’s third quarter, we have trimmed the loss by about 50 percent as a result of improved rate design in our regulated distribution operations and increased throughput and margins on the regulated Texas intrastate pipeline. However, we now anticipate an even greater decline in the nonregulated marketing and storage operations than originally projected primarily due to the prolonged reduction in natural gas price volatility,” Best said.

1

“Due to the complementary nature of our regulated and nonregulated businesses, we remain confident we can achieve our fiscal 2008 earnings guidance of between $1.95 and $2.05 per diluted share,” Best concluded.

Results for the 2008 Third Quarter Ended June 30, 2008

Natural gas distribution gross profit increased $9.3 million to $199.9 million for the fiscal 2008 third quarter, compared with $190.6 million in the prior-year quarter, before intersegment eliminations. The key driver in the period-over-period improvement was an $8.9 million increase in rates, primarily in the company’s Mid-Tex Division and six other service areas.

Regulated transmission and storage gross profit increased $9.6 million to $46.3 million for the three months ended June 30, 2008, compared with $36.7 million for the three months ended June 30, 2007, before intersegment eliminations. This increase primarily reflects higher revenues resulting from the company’s 2006 and 2007 filings under the Texas Gas Reliability Infrastructure Program (GRIP). Regulated transmission and storage gross profit also benefited from favorable market conditions that have continued in the Barnett Shale gas producing region in Texas, resulting in a 21 percent increase in consolidated throughput and the realization of higher per-unit margins.

Natural gas marketing gross profit reflected a loss of $2.6 million for the fiscal 2008 third quarter, compared with a loss of $0.6 million for the fiscal 2007 third quarter, before intersegment eliminations. This decrease primarily reflects a $4.2 million decrease in the realized storage and trading activities of Atmos Energy Marketing (AEM), as AEM realized losses in the current quarter from its decision to reset financial positions to forward months without corresponding storage withdrawals, in an attempt to increase the potential gross profit in future periods. Delivered gas margins increased $1.2 million, as a result of capturing favorable basis gains, which increase was partially offset by a four percent decrease in consolidated sales volumes. AEM’s unrealized gains increased $0.9 million during the current quarter compared with the prior-year quarter, principally due to a narrowing of the spreads between current cash prices and forward natural gas prices.

Pipeline, storage and other gross profit increased $1.4 million to $3.2 million for the three months ended June 30, 2008, compared with $1.8 million for the same period last year, before intersegment eliminations. The increase was largely due to smaller margin losses generated from asset optimization activities.

Consolidated operation and maintenance expense for the third quarter of fiscal 2008 was $117.8 million, compared with $115.1 million for the third quarter last year. Excluding the provision for doubtful accounts, operation and maintenance expense for the current quarter increased $2.4 million, compared with the prior-year quarter, primarily due to higher administrative costs.

The provision for doubtful accounts increased slightly to $2.9 million for the three months ended June 30, 2008, compared with $2.6 million for the same period last year, despite a 46 percent increase in gas costs, which reflects the impact of continued successful collection efforts.

2

Results for the Nine Months Ended June 30, 2008

Natural gas distribution gross profit increased $31.2 million to $830.7 million for the nine months ended June 30, 2008, compared with $799.5 million in the prior-year period, before intersegment eliminations. This increase primarily reflects a net $31.7 million increase in rates, principally in the Mid-Tex Division, and in six other service areas.

Regulated transmission and storage gross profit increased $20.2 million to $142.8 million for the nine months ended June 30, 2008, compared with $122.6 million for the same period last year, before intersegment eliminations. This increase reflects higher revenues resulting from the company’s GRIP filings, a 20 percent increase in consolidated throughput, primarily associated with increased production in the Barnett Shale region in Texas and higher per-unit margins earned due to greater demand.

Natural gas marketing gross profit decreased $25.9 million to $59.7 million for the fiscal 2008 nine-month period, compared with $85.6 million for the prior-year period, before intersegment eliminations. The decrease primarily reflects a $48.9 million decrease in AEM’s realized storage and trading activities resulting from a less volatile natural gas market and AEM’s decision to reset its financial positions to forward months without corresponding storage withdrawals to increase the potential gross profit in future periods, combined with increased storage fees charged by third parties. Delivered gas margins increased $11.3 million as a result of a 13 percent increase in consolidated sales volumes combined with capturing favorable basis gains. Unrealized gains increased $11.7 million period over period, principally due to a narrowing of the spreads between the current cash prices and forward natural gas prices.

Pipeline, storage and other gross profit decreased $7.9 million to $18.9 million for the nine months ended June 30, 2008, compared with $26.8 million for the nine months ended June 30, 2007, before intersegment eliminations. The decrease primarily was due to lower realized margins from storage and asset optimization activities in a less volatile natural gas market, which created fewer opportunities to capitalize on price fluctuations along with lower unrealized margins.

Consolidated operation and maintenance expense for the nine months ended June 30, 2008, was $359.1 million, compared with $342.4 million for the prior-year period. Excluding the provision for doubtful accounts, operation and maintenance expense for the current nine months was $349.8 million, compared with $329.1 million for the prior-year period. The $20.7 million increase was mainly due to higher pipeline maintenance, odorization, fuel and other administrative costs. Additionally, the prior-year expense was abnormally low due to $4.3 million of previously incurred operation and maintenance expenses related to Hurricane Katrina recovery efforts being reversed and deferred due to a Louisiana Public Service Commission’s decision to permit the recovery of these expenses from customers.

The provision for doubtful accounts was $9.3 million for the nine months ended June 30, 2008, compared with $13.3 million for the same period last year. The $4.0 million decrease reflects the effect of successful customer collection efforts.

Interest charges for the nine months ended June 30, 2008, were $103.8 million, compared with $109.3 million for the nine months ended June 30, 2007. The $5.5 million period-over-period decrease primarily was due to lower average short-term debt balances experienced in the current period.

3

The capitalization ratio at June 30, 2008, was 51.5 percent, compared with 53.7 percent at September 30, 2007, and 55.0 percent at June 30, 2007. In June 2007, the Company completed a $250 million senior notes offering, the net proceeds of which along with available cash were used to reduce long-term debt by $300 million in July 2007. Had the repayment occurred as of June 30, 2007, the company’s debt capitalization ratio on that date would have been 51.7 percent. Short-term debt was $113.3 million at June 30, 2008, and $150.6 million at September 30, 2007. There was no short-term debt outstanding at June 30, 2007.

For the nine months ended June 30, 2008, operating activities provided cash of $417.4 million, compared with $552.7 million for the nine months ended June 30, 2007. Period over period, the decrease in operating cash flow primarily reflects an increase in cash required to collateralize risk management accounts as of June 30, 2008, coupled with net unfavorable changes in various working capital items.

Capital expenditures increased to $312.9 million for the nine months ended June 30, 2008, compared with $263.0 million for the same period last year. The $49.9 million increase principally reflects spending in the Mid-Tex Division for the replacement of mains and for the company’s new automated metering initiative in its natural gas distribution business.

Outlook

The leadership of Atmos Energy remains focused on enhancing shareholder value by delivering consistent earnings growth. Atmos Energy continues to anticipate fiscal 2008 earnings to be in the range of $1.95 to $2.05 per diluted share, excluding any material mark-to-market impact at the end of the fiscal year, with capital expenditures expected to range from $455 million to $465 million. Major assumptions underlying the earnings projection include a reduced contribution from the natural gas marketing segment due to less volatility in natural gas prices, continued successful execution of the rate strategy in the natural gas distribution segment and an average annual short-term interest rate of 6.5 percent. However, the mark-to-market impact on the nonregulated marketing company’s physical storage inventory at September 30, 2008, and changes in events or other circumstances that the company cannot currently anticipate or predict could result in earnings for fiscal 2008 that are significantly above or below this outlook.

Conference Call to be Webcast August 6, 2008

Atmos Energy will host a conference call with financial analysts to discuss the financial results for the fiscal 2008 third quarter and first nine months on Wednesday, August 6, 2008, at 8:00 a.m. EDT. The telephone number is 800-218-4007. The conference call will be webcast live on the Atmos Energy Web site at www.atmosenergy.com . A playback of the call will be available on the Web site later that day. Atmos Energy officers who will participate in the conference call include: Bob Best, chairman, president and chief executive officer; Pat Reddy, senior vice president and chief financial officer; Kim Cocklin, senior vice president, regulated operations; Mark Johnson, senior vice president, nonregulated operations; Fred Meisenheimer, vice president and controller; Laurie Sherwood, vice president, corporate development and treasurer; and Susan Giles, vice president, investor relations.

4

Highlights and Recent Developments

Fort Necessity Gas Storage Project

On July 10, 2008, Atmos Pipeline and Storage, LLC, completed a nonbinding open season for its proposed Fort Necessity salt dome gas storage facility located in Franklin Parish, Louisiana. The open season participants requested storage capacity that was three times greater than the 5 billion cubic feet of capacity proposed in Phase One of the project.

Drilling operations recently began to obtain core samples necessary to complete the FERC 7C application. Pending regulatory approval, the first cavern is projected to go into operation by 2011, with the other two caverns in operation by 2012 and 2014. Based on market demand, four additional storage caverns could potentially be developed.

Mid-Tex Division Rate Case Decision

On June 24, 2008, the Railroad Commission of Texas (RRC) issued a final order in the rate case originally filed by the Mid-Tex Division in September 2007. The final order applies to the remaining 20 percent of customers served by the Mid-Tex Division that were not included in previously announced settlement agreements. The final order from the RRC resulted in a $19.6 million system-wide annual rate increase, of which approximately $3.9 million related to customers in the City of Dallas and the unincorporated areas. New rates were implemented in July 2008 for these customers. The rates for the remaining 80 percent of the customers, which are represented by 438 of the 439 incorporated cities served by the Mid-Tex Division, had already been established through settlements by these cities with the company.

Additional findings of the RRC order include a 10 percent return on equity, a capital structure of 52 percent debt and 48 percent equity, the recovery of bad debt gas cost via a Gas Cost Recovery mechanism and approval of a conservation and energy efficiency tariff.

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, 2007, and in the company’s Quarterly Report on Form 10-Q for the three and six months ended March 31, 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.

5

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 .

6

7

8