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First Solar, Utilities Say Big Solar Farms Cheaper Than Rooftops

Building vast fields of solar panels for utilities is cheaper than bolting lots of little ones to rooftops, and now First Solar Inc. has more data to prove it.

The largest U.S. developer of utility-scale solar farms joined a utility industry group to fund a study that found rooftop solar systems can be more than double the cost of large ground-mounted power plants.