The much publicized Telsa Powerwall battery offers a way for homeowners with solar panels to store their energy for use at night as well as help utilities manage the grid.
Yet a decidedly less flashy piece of equipment residing in basements and closets of homeowners holds much greater potential as a residential battery – electric water heaters.
For the past 30 years Great River Energy (GRE) has deployed electric water heaters in homes to manage loads. Today more than 110,000 homes – around 20 percent of its to customer base – have water heaters that collectively, according to the utility, amount to a gigawatt of storage.
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