Both Siemens and GE bet on direct-drive generators.
New ultracapacitor material could be fabricated directly on chips and solar cells.
The process involves freezing old rubber and shattering it into small particles--resulting in new, low-cost materials.
Storing carbon dioxide in cement.
Nanoparticles boost solar power’s prospects.
Mimicking human disease in a dish.
Designing the perfect renewable fuel.
Fatal disasters might be averted if existing tech was more fully deployed.
Solar-cell manufacturing techniques could yield LEDs that require 20 percent less energy.
China's solar giant shifts its strategy.