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SEPA finds big US growth in battery storage, paves way for smart grid

The Smart Electric Power Alliance (SEPA) has published its survey of US utilities, and has some promising findings for smart grid advocates. Grid-scale battery storage capacity has grown 68% in the past year, up to 1.3 GWh, with longer-duration batteries becoming more prevalent. Residential storage was the strongest performer, growing some 317%. The longer duration units make it important to clarify that there are two ways of measuring battery capacity – how much energy it can hold (in watts), and how long you can run it for (in watt-hours). Watts measure power, while watt-hours measure energy. Essentially comparable to the difference between speed and distance, with batteries, watt-hours are telling you how long you can run the battery for. This…

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