The money has helped the solar and wind industries, but hasn't created many manufacturing jobs.
Optical antennas could help solar cells produce more energy.
The maker of nuclear power plants is promoting a process to use the waste as fuel.
A new design can make more-efficient thin-film solar cells using existing manufacturing equipment.
IBM researchers have greatly increased the performance of a novel thin film solar cell.
Cells absorb sunlight concentrated 1,000 times without cooling.
Government incentives and lower solar prices are starting to pay off.
A research project will make jet fuel without wasting fresh water or farmland.
Developers think these phase-change materials could reduce the need for air-conditioning.
Loan guarantees in the 2011 federal budget could help revive the nuclear power industry.