Tesla Inc. builds more than cars, and CEO Elon Musk has invested $5 billion into a  battery storage facility. The energy storage business is still not cost-efficient, with battery production costing between 15 and 35 cents per kilowatt-hour compared to a natural gas cost of 7 cents per kilowatt-hour. However, energy storage economies of scale and demand are expected to grow. One useful concept is realizing that batteries are a valuable option when demand is high and energy is in short supply. True, regulatory hurdles are still present, but are expected to be overcome when commercial demand from utilities starts to build.

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