SRP to propose mixed-resource project to its board in September
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- SRP will seek board approval in September for the Marigold Energy Center, a mixed-resource project roughly 45 miles south of Phoenix to serve growing demand in Maricopa and Pinal counties
- The Marigold project combines 400 MW of battery storage, 600 MW of solar generation, up to 675 MW of gas generation, a new substation, and four miles of 230-kV transmission lines
- Electrical District No. 3 is evaluating a partnership with SRP to procure a portion of Marigold's energy to serve its own customers
- SRP will host an in-person open house in Stanfield on July 28 and a virtual meeting July 29, following prior sessions at Stanfield Elementary School in December and March
- Energy Dome, backed by Google, is building a 19-MW, 10-hour CO2-based battery at SRP's Coronado Generating Station in St. Johns, Arizona, under a deal announced in June
- ESS Tech is developing a 5-MW/50-MWh iron-flow battery pilot for SRP under a storage purchase agreement announced in October
Why it matters: SRP is pairing 1,000 MW of solar-plus-storage with up to 675 MW of new gas at Marigold — a signal that Arizona's hottest-growth utility is leaning on firm thermal capacity to backstop renewables rather than going pure solar-plus-storage. The potential ED3 partnership broadens Marigold from a single-utility project into a regional resource serving two of Arizona's fastest-growing counties.
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