Invenergy brings Arizona portfolio to 600MWh+ with tenth commissioned project

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IPP Invenergy has put a 50MW BESS into commercial operations in Arizona, US, its tenth in the state.

The independent power producer (IPP) has completed the 50MW/200MWh El Sol Energy Storage Center, located on the outskirts of Phoenix.

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It is the tenth battery energy storage system (BESS) project Invenergy has put into commercial operations in the state, all of which are in Maricopa and Yuma Counties and have agreements with utility Arizona Public Service (APS).

Brian Cole, VP resource management at APS, commented: “Arizona has experienced an extended stretch of triple-digit temperatures this summer and APS customers have used a record-breaking amount of energy as they run their air conditioners to stay cool.”

“Adding renewable projects like the El Sol Energy Storage Center to our already diverse power supply will help APS continue to deliver the reliable, affordable and increasingly clean energy our customers count on, especially on our hottest summer days.”

The table below shows all of Invenergy’s BESS projects in Arizona, including commercial operation date (COD). Ten are in operation with an 11th, Yuma Storage, set to come online this year too.

Name CountyMWMWhCOD
Cotton CenterMaricopa County17512023
Desert StarMaricopa County10302023
El SolMaricopa County502002024
Foothills IYuma County17.552.52023
Foothills IIYuma County17.552.52023
Gila Bend IMaricopa County16482023
Gila Bend IIMaricopa County16482023
PalomaMaricopa County17512023
Hyder IYuma County16482023
Hyder IIYuma County14422023
Yuma Storage Yuma County702802024

The ten operational projects total 191MW/623MWh while Yuma Storage, the largest single project at 70MW/280MWh, will increase that total by around one-third, leading to a total operational portfolio of 261MW/903MWh.

The firm also has operational and under-construction BESS projects in Illinois, Wisconsin, West Virginia, New York, and Iowa, with 20 in total listed on its website across all states and stages.

Arizona has quickly become one of the most active grid-scale BESS markets in the US after California and Texas. In the past month, utility Tucson Electric Power announced it would build a second 200MW/800MWh project in the state, while Salt River Project (SRP) signed an offtake agreement for a 250MW/1,000MWh system, with both systems set to come online in 2026.

2 December 2025
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