According to the latest edition of Wood Mackenzie’s U.S. energy storage monitor, the country deployed 476 MW of energy storage in Q2, 240% more than was installed in Q2, which just so happened to be the previous quarterly record for installed capacity. That 476 MW mark represents more than 500% year-over-year growth from Q3 2019.
The jump in capacity forced WoodMac to edit the y-axis on it’s deployment graph, producing a pretty funny result:
As the graph shows, this exponential capacity increase was driven predominantly by the front-of-the-meter (FTM) market, with that segment alone representing more capacity than the total installations across all segments in any other quarter from the past 7 years.
Beyond MWs
Pure MWs installed, however, are not the main focus of deployed storage, with the other half of the story being told by MWh deployment. What’s interesting here is that, while the 764 MWh deployed in Q3 is a record in its own right, more than doubling the previous record of 378 MWh in Q4 2018, that figure is less than double that of the 476 MW installed, yet most batteries are developed for four-hour charge or discharge.
The answer to this oddity comes from California, where numerous installations were built for only one hour of capacity, though many were also planned or built with the capability to move to four-hours in duration in the future. This phenomenon includes LS Power’s Gateway Energy Storage project, the largest grid battery in the world, clocking in at 230 MW and 230 MWh, with plans to expand to 250 MW/250 MWh.
Just as it was with MW deployed, FTM installations drove this record quarter, with additions growing 475% compared to Q2 and beating the previous FTM record, set in Q1 2017, by nearly 200%.
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