First Solar posted a surprise quarterly loss, but raised its full-year profit outlook as it drives down production costs for its solar panels, while peer SunPower slightly beat Wall Street forecasts.

Ener1, which received a $118.5 million U.S. Department of Energy grant, filed for bankruptcy protection amid heavy competition and after the demise of a large customer.

New clean-technology techniques have states competing for the benefits these firms can bring to the economy and the local labor markets.

The U.S. Commerce Department launched an investigation that could lead to steep import duties on more than $100 million worth of wind energy towers from China and Vietnam.

T. Boone Pickens’ natural gas distribution vehicle got more gas after Navistar International said it would start making truck engines that use alternative fuels.