Forget ethanol: it's hard to transport and gives bad mileage per gallon. Another alcohol, butanol, is a much better renewable fuel, says the president of BP Biofuels.
A new type of material could allow solar cells to harvest far more light.
A new MIT study says that no single technology is the solution to economically cutting carbon-dioxide emissions from coal.
A new MIT report says that much more effort is needed to develop and test technology that will make clean-coal power plants economical and practical.
A veteran venture capitalist's new energy.
Arthur Nozik believes quantum-dot solar power could boost output in cheap photovoltaics.
Solar cells, camera lenses, and LEDs could benefit from new antireflection coatings.
Carbon nanotubes could help make nanoparticle-based solar cells more efficient and practical.
One of the largest solar energy plants in the world went on line in Portugal this winter.
A secret, fast-charging, powerful battery.