By Lisa Beilfuss 

Southern Co., one of the biggest utilities in the U.S., said warmer weather and customer growth helped lift second-quarter profit more than 2%, though sales declined and the company took a bigger hit from its delayed Kemper County plant project.

Chief Executive Thomas Fanning said that for the first time since 2004, the company has had consecutive quarters of weather-normalized growth in all three customer classes. Residential energy sales rose 4.6% while commercial sales grew 2.3%. Adjusted for weather, residential sales rose 1.2% and commercial sales increased 0.7%.

The Atlanta company's results in recent quarters have been dogged by charges stemming from its Kemper County project, a clean-coal power plant under construction in Mississippi that had been expected to provide a bright future for the coal industry. Southern has repeatedly delayed completion dates, and was dealt a blow in May when South Mississippi Electric Power Association, which furnishes power to smaller utilities in the state, pulled its investment in Kemper.

The company during the quarter booked a $14 million after-tax charge related to Kemper construction delays, more than double the charge booked in the first quarter.

A spokeswoman on Wednesday said the company remains focused on an expected in-service date for Kemper in the first half of 2016.

For the quarter, Southern reported a profit of $643 million, up from $628 million a year earlier. On a per-share basis after the payout of preferred dividends, earnings rose a penny to 69 cents. Excluding the loss stemming from Kemper, earnings per share were 71 cents.

Revenue declined 2.9% to $4.34 billion. Fuel revenue fell 13%, while other revenue increased 4.4%.

Analysts anticipated 69 cents in earnings per share and $4.67 billion in revenue, according to Thomson Reuters.

Shares in the company, down 12% this year, slipped 0.6% in afternoon trading.

Write to Lisa Beilfuss at lisa.beilfuss@wsj.com

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