Ener1, which received a $118.5 million U.S. Department of Energy grant to make batteries for electric cars, filed for bankruptcy protection amid heavy competition and after the demise of a large customer.
Toyota Motor and BMW plan to work together on advanced environmental car technologies, including the development of lithium-ion batteries for electric vehicles.
A federal judge in California blocked that state's rules designed to favor producers of gasoline and other fuels, a victory for ethanol producers and refiners.
Warren Buffett stole headlines with the announcement that MidAmerican Energy Holdings, a Berkshire Hathaway branch, was venturing heavily into the solar energy sector.
From growing your own food to conserving energy, CNBC.com guest blogger Terry Tamminen offers strategies to save the planet and money — just in time for new year's resolution season.
Ford fell after missing earnings estimate on weaker sales in Europe and higher input costs. Alan Mulally, Ford Motor president & CEO, explains the earnings shortfall, with CNBC's Phil LeBeau.
"We said get on your own resources and honestly if we don't get on our own resources we have got to be pretty stupid people," says T. Boone Pickens, BP Capital founder/CEO. Pickens weighs in on natural gas prices and the amount of oil in Alberta that should be tapped into.