An innovative startup that blends solar energy and battery storage reflects broader interest combining the technologies.
Researchers have demonstrated a long-lasting device for making hydrogen from sunlight and water—but funding is running out.
The Indian government hopes to increase the country’s solar capacity 30-fold by 2020.
The chemical company BASF says the basic type of battery used now in hybrids could be improved tenfold, leading to cheaper electric cars.
The world’s largest and cheapest reverse-osmosis desalination plant is up and running in Israel.
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.