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Small rooftop solar panels and wind generators are available right now at deep discounts.
You can get rebates from the state to help cover the capital costs of the project.
After being available for several years, most energy providers in CA stopped selling green power in late 2000 because of the energy crisis.
Here are some links to see what types of green power are currently available in CA and elsewhere in the US:
EPA Green Power Partnership
Berkeley Energy Office
AWEA Green Power Factsheets
CA Energy Commission Renewable Energy Program
Green-e