While Robert Downey Jr.’s Tony Stark is currently saving the world by battling Ultron, the real life Tony Stark, Elon Musk, is saving the world with Tesla Energy, which he’s now officially unveiled.

Tesla Energy is a battery system that comes in two products: the Powerwall, which is for home use and costs either $3,000 or $3,500 based on the kWh, and the Powerpack, a bigger, “infinitely scalable” system that could work for businesses, industrial application, and other major uses that require more power than a conventional home. The Powerpack comes in 100 kWk battery blocks that can scale beyond 10 MWh.

Tesla Energy seems to be a response to climate change and an effort to change the way energy is produced and used. The batteries power everything with stored solar energy and, according to Musk, 160 million Powerpacks could power the United States while 2 billion could power the world.

As far in-house applications go, the Telsa Energy batteries would allow owners of Tesla’s electric cars to charge their cars at night when direct solar charging isn’t an option.

As The Verge points out, harnessing renewable energy isn’t as big of an issue as storing it, and that’s what makes the Tesla Energy batteries so effective: their capacity for stored solar energy. Musk likes to think big, and while this is a big idea, it’s also a very simple, practical. A good one, too.

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