The cost of solar has fallen to a point where it can compete with grid power in some places.
A report from the National Academy of Sciences says inaction on greenhouse-gas emissions makes resorting to geoengineering more likely.
Transatomic Power has begun tests on a very cheap and compact molten-salt reactor.
A promising advance that came to nothing suggests what it will take to make cheap batteries for electric cars.
The former energy secretary, who has begun chasing emerging technologies again, looks back on his successes and failures in government.
A startup called SolidEnergy has developed a kind of lithium-ion battery that stores far more energy.
Researchers have found a way to augment ordinary silicon solar cells with a material called a perovskite.
Carmakers must also push out more of the cleaner vehicles to meet average fleet emissions standards.
640Labs, acquired by Monsanto, provides analytics that can help farmers increase production.
A new design for a molten-salt reactor could make nuclear power safer and more economical.