How much does it cost to install a geothermal energy source to power a home? I am doing a project and I am wondering if it is cost-effective to install a geothermal energy source or solar panels? How much would installing a geothermal energy source cost, and would it make enough energy to supply a typical Californian family throughout the year?

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If you have a source of geo thermal power, it shouldn%26#039;t cost more that $15k. 100% 2 Votes

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