Under a new law, California's three investor-owned utilities must buy 20 percent of their power from alternative energy sources such as wind and solar.
In Oregon's Willamette Valley, electricity for 65 homes will be produced from "bio-gas" from the manure of 400 Holstein cows.
Some critics say a proposed geothermal power plant threatens the newly designated Black Rock Desert-High Rock Canyon Emigrant Trails National Conservation Area in northwestern Nevada.
The largest wind farm in the world is being constructed on the Oregon-Washington border near Walla Walla, Washington.
Electricity providers in Arizona will have to increase the amount of renewable energy resources that they use.
The Emerald People's Utility District near Eugene, Ore., plans to provide "green power" to its customers, encouraging energy production that doesn't harm air quality or salmon.
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