Rooftop solar could save utilities $100 to $120 per installed kilowatt

(credit: Lawrence Berkeley Labs)

When you install rooftop solar panels, the electricity you create cuts into the amount of electricity the utility must provide to meet your needs. Add up the reduced demand of all the homes with solar panels, and you've got a pretty sizable amount of electricity that's no longer needed.

Researchers from Carnegie Mellon and the National Renewable Energy Laboratory (NREL) quantified that reduced demand and found that solar panels installed between 2013 and...

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