Can Elon Musk’s solar roof tiles replace fossil fuels in housing?

At the National Governors Association Summer Meeting in July, Elon Musk  claimed that the U.S. can run solely on solar energy.

“If you wanted to power the entire U.S. with solar panels,” he said, “it would take a fairly small corner of Nevada or Texas or Utah; you only need about 100 miles by 100 miles of solar panels to power the entire United States.” In October 2016, Musk unveiled Tesla’s latest products: a solar roof and an updated Powerwall 2 and Powerpack 2. Tesla, Musk’s electric car company, acquired photovoltaics company SolarCity in 2016 for $2.6 billion. The deal merged the two companies, allowing the tech millionaire to sell and advertise Tesla products and solar roofs for a fully integrated solar home.

Energy gathered from the solar roof will be stored into a Tesla Powerwall, a 14 kWh battery for residential homes (it is scalable up to nine Powerwalls in one unit). During the day, the solar shingles will generate electricity and recharge the batteries, which will then provide power at night in place of a traditional utility grid. Each unit has enough capacity for a day’s worth of power. The Powerpack 2 is meant for commercial use and is limitlessly scalable.

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