By Angela Chen 

NRG Energy Inc. said Friday that it swung to a profit in the December quarter, as favorable margins helped earnings more than double in its renewables segment.

Chief Executive David Crane said that declining commodity prices and mild weather hurt the company, but he added that it was well-positioned for growth in 2015.

NRG Energy, one of the biggest electricity producers in the U.S., said in August that it would reorganize the company to focus more on the industry's high-growth segments. The reorganized company will consist of three main business lines: NRG Business, NRG Home and NRG Renew.

The company has been moving into alternative energy as its wholesale-power operation struggles amid low natural-gas prices. In April, it completed its acquisition of an Edison International unit's coal plants, wind farms and other assets out of bankruptcy in a $2.65 billion deal and recently bought residential solar company Roof Diagnostics Solar.

Adjusting for acquisitions and other one-time expenses, income fell 16% in the business segment, 8% in the home retail segment, but more than doubled in the renew segment. The losses were mostly because of mild weather, while the growth in the Renew segment was in part due to better margins from existing assets.

Overall, NRG reported a profit of $119 million, compared with a year-earlier loss of $297 million.

The company affirmed its full-year guidance, which it had previously lowered in November.

Shares of NRG, inactive premarket, have been off about 9% in the year through Thursday's close.

Write to Angela Chen at angela.chen@dowjones.com

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