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SRP has two other battery storage projects, both of which are pilots. One is the Pinal Central Solar Energy Center, a 20 MW, integrated solar energy and battery storage plant in Casa Grande. The other is the Dorman battery storage system, a 10 MW/40 MWh stand-alone battery storage system in Chandler.
While most solar PV systems that are co-located with battery storage have in past been AC-coupled, requiring two separate inverters, one for the solar and one for the battery system, there has since about 2018 been a rise in the number of project developers and designers electing to go DC-coupled.
Battery storage can make the gap between times of high solar production and times of peak demand shorter. As such, the Massachusetts Department of Energy Resources (DOER) has recognised that the SMART programme should be designed to enable battery storage to add dispatchability to solar.
Salt River Project said on September 16 that it had placed a 25 MW battery storage facility at its Bolster Substation into service. The facility, which consists of a series of Tesla Megapacks connected to SRP’s energy grid, is currently the biggest standalone battery storage system in Arizona.
“Declining cost for battery storage applications, favorable economics when deployed with renewable energy (predominantly wind and solar PV), and value-added additions in regional transmission organization (RTO) markets have helped drive the expansion of battery storage,” the EIA said.