A grass-roots movement to generate power in towns and basements is challenging the energy industry's status quo. In the late 1990s, the town of Freiamt in Germany's Black Forest decided to take the fight against global warming into its own hands. Three hundred of the town's 4,300 residents chipped in to buy the four 80-meter-tall Enercon wind turbines that now top the surrounding hills, generating 1.8 megawatts each. An additional 270 families put solar collectors on their roofs to heat water and power their homes. Three businesses