Marigold Energy Center
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About the project
SRP is planning the Marigold Energy Center, a mixed generation and storage facility project designed to meet near-term energy and capacity needs in central Arizona.
Plans are anticipated to include:
A 230-kilovolt (kV)/500 kV substation |
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Approximately 4 miles of new 230 kV transmission lines |
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600 megawatts (MW) of solar generation |
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400 MW of battery energy storage |
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Up to 675 MW of gas-fired generation |
This project will build on SRP’s commitment to provide Arizona with reliable and affordable power to keep up with economic growth. The project has the potential for collaboration with Electrical District
No. 3 (ED3), a regional public power utility serving the communities of Maricopa, Stanfield and the surrounding area. ED3 is evaluating a potential partnership with SRP to procure a portion of the energy generated by the Marigold Energy Center, enhancing its ability to serve local customers with reliable and competitively priced electricity.
Why is this project needed?
When completed, these generation and transmission resources will strengthen the power grid and help ensure that SRP can meet the electricity demand of a rapidly growing population. This combination of technologies will provide flexible, dispatchable capacity to support the growing customer base in Maricopa and Pinal counties while enhancing grid reliability and enabling the integration of intermittent renewable energy resources.
Next steps
SRP management intends to seek approval from the SRP Board at its publicly noticed meeting on Sept. 14, 2026. For information on how to participate in person or virtually, please contact the SRP Corporate Secretary's office at (602) 236-4398(602) 236-4398 or by email at [email protected].
The natural gas generation and transmission infrastructure will also require a Certificate of Environmental Compatibility (CEC) from the Arizona Corporation Commission (ACC). As part of the CEC process, the Arizona Power Plant and Line Siting Committee will hold a public hearing concerning the proposed natural gas plant and transmission infrastructure. This hearing is anticipated to begin on Sept. 21, 2026. Hearing details will be posted on the project website as they become available.
Proposed location
Current proposed Marigold Energy Center location.
Past events
July 28, 2026: Open House Meeting
SRP hosted an open house at the Stanfield Elementary School on July 28, 2026.
March 25, 2026: Open House Meeting
SRP hosted an open house at the Stanfield Elementary School on March 25, 2026.
December 10, 2025: Open House Meeting
SRP hosted an open house at the Stanfield Elementary School on December 10, 2025.
Contact us
If you have questions about the project, please complete the form below, call (602) 236-2872(602) 236-2872 or email [email protected].
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