Tesla's Industrial-Grade Solar Power Storage System

Panel installer SolarCity uses the same batteries as the Model S
SolarCity panels installed on homes at the Davis-Monthan Air Force Base near Tucson, Ariz. Courtesy SolarCity

It’s weird to see the big red-and-white Tesla Motors “T” logo hanging from the side of a house or a building, but suddenly, there it is. On Dec. 5, Tesla revealed a partnership with alternative-energy company SolarCity, which sells and installs solar panels for residential and commercial customers. SolarCity is offering an industrial-grade battery built by Tesla, a sign that the auto company wants to get into the battery pack and energy businesses.

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