Because you can't just move a wind turbine once you've installed it, a complicated computer program that analyzes everything from tides to deforestation is taking the guesswork out of where to put them.
Corporate ethics is booming. Every major company has its own social responsibility (CSR) program, sustainability consulting is big business, and more and more companies are jumping onto the do-good, do-green bandwagon.
You have seen our Fast Company 50. But what are the companies within specific categories doing creative and ground-breaking work? Who is leading an industry into the future? Here we present the top ten firms in Clean Energy.