Solar Impulse, an ultralight plane powered completely by the sun, will kick-off its coast-to-coast flight across the U.S. from Moffett Airfield in Mountain View on May 1.

The San Mateo Resource Conservation District is spearheading a project that will remove a concrete barrier from the San Francisquito Creek, making it easier for fish to swim through.

Take 50 Stanford University engineering students, give them $250,000 and two years, and what do you get? An affordable net-zero energy house for the 2013 Solar Decathlon.

Challenges of cost and scale make businesses less likely to jump on board California’s push for solar energy.

Palo Alto’s environmentalists are locked in debate with one another over plans to construct a compost-to-energy facility. Residents are divided over whether the city should use the land to convert organic waste into clean energy.