cleantech

Delayed and Shrinking: Masdar City Scales Back Its Clean-Energy Plans

Masdar, the $22 billion green city that United Arab Emirates capital Abu Dhabi is building in the desert just outside its borders, has canceled its plans to generate all of its own clean energy and to emit zero carbon -- and says it's running at least four years behind schedule.

Tesla's Shiny New Stock
Runs Out of Juice

Tesla's electric cars have amazing acceleration, but the company's stock has been moving even faster since its IPO last week. It shot up 79% in its first two days, but has since fallen below the IPO price. Venture capitalists and cleantech startups are watching carefully.

Will the Oil Spill Be Good for Clean Energy?

While the BP oil spill is an ecological disaster, this big slick has a silver lining. Alternative-energy technologies may benefit from the public backlash against fossil fuels. But the spill could also help kill the energy bill and its support for renewables.

It's Show-Time for Bloom Energy's Supersecret Fuel Cells

After a long period of ever-escalating anticipation, the startup California cleantech company is finally unveiling its technology. Will the claims of breakthroughs in terms of efficiency, affordability and scalability get borne out at last? And how much will the long-term cost really be?