Geothermal Power
Energy is harnessed by tapping natural underground reservoirs of steam and hot water.
Hot water produces steam which is used to turn turbines and generate electricity.
https://www.youtube.com/watch?v=mCRDf7QxjDk
Reservoirs of steam and hot water occur where subsurface temperatures are high due to recent volcanic activity
Geothermal sources often have geysers and hotsprings within the surrounding areas.
Geothermal Power near us!
The Geysers: a CalPine Company
https://vimeo.com/58388803
“The Geysers meets the typical power needs of Sonoma, Lake and Mendocino counties, as well a portion of the power needs of Marin and Napa counties. In fact, The Geysers satisfies nearly 60 percent of the average electricity demand in the North Coast region from the Golden Gate Bridge to the Oregon border. The Geysers is one of the most reliable energy sources in California, delivering extremely high availability and on-line performance, and accounts for one-fifth of the green power produced in California”
http://www.geysers.com/default.aspx