Geothermal Heats Up

Solar and wind power may get the headlines when it comes to renewable energy. But another type of clean power is heating up in the hills just north of Sonoma wine country. Geothermal power uses heat from deep inside the Earth to generate electricity. The Geysers, the world's largest power-producing geothermal field, has been providing electricity for roughly 850,000 Northern California households, and is set to expand even further.