18.5 Billion Solar Panels Could  Power the U.S., but ...
To generate electricity from the sun, you need either to collect solar radiation and convert it with photovoltaic cells to DC power, then to AC with an inverter, or you need to concentrate the sunlight onto one central collector from acres of "mirrors" and let the combined, concentrated heat from the sun power a turbine generator to make electricity. Both take up plenty of real estate.

In 2015, the U.S. consumed 4,637,314 million kilowatts of electricity. According to the EIA, here is...


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