Elon Musk and Tesla are taking the expanding Supercharger network off-grid, with an end goal of one day running almost completely off of solar power and batteries. Since the electric grid is still mostly powered by coal and natural gas, disconnecting from allows them to go green in a more meaningful way, at least for now. The Supercharger network is a critical selling point for Tesla customers, giving them a way to completely power a vehicle within 30 minutes.
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