When the box turns red, it's time to turn off the air conditioner and save electricity.
Placing tiny spheres of silicon in reflective trays could be the key to cheap, efficient solar cells.
New laws should address long-term energy concerns--even if they lead to higher energy prices.
Startup Kior has developed a process for creating "biocrude" directly from biomass.
Biofuels that can be transported with existing pipelines could have an edge over ethanol.
GM is on the hybrid bandwagon while other automakers continue to argue against it.
A study released by the National Security Space Office says that space-based solar-power systems could be built within several decades.
Photovoltaics made of nanowires could lead to cheaper solar panels.
Big batteries will fight blackouts and could make renewable power economically viable.
Determining how fast ice sheets are melting is critical to future policy.