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Massachusetts — The U.S. energy storage market set a new record in the fourth quarter of 2021, with new system installations totalling 4,727-megawatt hours (MWh).

According to Wood Mackenzie, and the American Clean Power Association’s (ACP) latest U.S. Energy Storage Monitor report, Q4 2021 saw more capacity installed than in the first three quarters combined, despite project delays.

Annual deployments of grid-scale storage nearly tripled year-over-year to 3 gigawatts (GW) / 9.2-gigawatt hours (GWh). Despite a record year, the grid-scale market didn’t meet expectations in 2021, with supply chain challenges delaying more than 2 GW of capacity into 2022 and 2023. Wood Mackenzie forecasts that supply chain pressures and delays within interconnection queue processing will persist through 2024.

Jason Burwen, Vice President for Energy Storage at American Clean Power, said, “2021 was yet another record for the U.S. energy storage market, with annual installations of multiple gigawatts for the first time. Even in the face of continued macro-economic headwinds, interconnection delays, and lack of proactive federal policy, increasing demand for resilient clean energy and volatility in the price of fuel-based generation will drive energy storage deployment forward.”

Burwen added: “Despite supply tightness leading to some project delays, the grid-scale market is still on track for exponential growth.”

System component price gains experienced over recent years have nearly been wiped out by higher costs for raw materials and transportation. Specifically, battery module pricing saw the largest increase of all system components due to the increased cost of raw materials.

Residential storage had its strongest quarter to date with 123 MW installed, beating the previous quarterly record of 110 MW in the first quarter of 2021. Increasingly effective solar-plus-storage sales in markets outside of California helped establish the new quarterly benchmark and resulted in a national annual total of 436 MW.

By 2026, annual installations in the residential segment are expected to hit 2 GW / 5.4 GWh, with frontrunners in California, Puerto Rico, Texas, and Florida leading that market segment.

Chloe Holden, an analyst with Wood Mackenzie’s energy storage team, said: “Puerto Rico’s position in the residential U.S. solar-plus-storage market comes as no surprise, and demonstrates how outages can drive battery adoption, with thousands of new residential installs emerging each quarter and competition increasing between local installers.”

She added: “Outages in Puerto Rico are also driving customers to recognize the added value of resilience that solar-plus-storage systems offer, despite premium pricing and lack of incentive programs. This is also driving solar-plus-storage market growth in Florida, the Carolinas and parts of the Midwest.”

The report found that the California storage market remains resilient as policy and developments, such as NEM 3.0, shake up the solar market.

The non-residential storage segment delivered 131 MWh in the fourth quarter resulting in 162MW / 350MWh of total annual deployments in 2021. Segment demand was driven by increased storage attachment rates within the community solar markets of New York and Massachusetts.


Wood Mackenzie

Derick Lila
Derick is a Clark University graduate—and Fulbright alumni with a Master's Degree in Environmental Science, and Policy. He has 8+ years of solar industry research, marketing, and content strategy experience.

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