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Tesla Motors (TSLA), as its name suggests made its name with its electric cars. But it's most definitely not just a car company anymore. Even before the purchase of SolarCity, Tesla had already begun selling power storage units for use in the home and by utilities.

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In a report today, a team of analysts including Morgan Stanley's Stephen Byrd take a deep dive into power storage, arguing that it's an "underappreciated disruptor." The reason: "Increasing renewables growth is causing two issues that can be addressed by energy storage: a power supply/demand mismatch, and unpredictability of power output." As a result, they "expect U.S. utilities to deploy large amounts of storage in the next 2-5 years."