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Maricopa County, Arizona: solar, wind, and storage projects and permits
Planned power plants, county offices, and the rules for a utility-scale lease, a business system, or rooftop solar in Maricopa County, county seat Phoenix.
Check land in Maricopa CountyOpens the land report with the map on the county; click a spot for its flood, wetland, habitat, line-distance and parcel check.
What power plants are planned in Maricopa County?
EIA's August 2026 survey lists 10 planned plants in Maricopa County, about 3,792 MW in all. Operating today, per the same EIA file: 11,642 MW gas, 4,210 MW nuclear, 3,927 MW solar, 3,502 MW battery storage.
What stands out in Maricopa County
By capacity, battery storage leads in Maricopa County with 1,850 MW at 8 plants, followed by gas (2 plants, 1,642 MW) and solar (1 plant, 300 MW); 1 plant pairs two technologies on one site. The largest is Saddleback Generation Station, 1,250 MW of gas (combined cycle) owned by Copia Power, planned with approvals not started, with a planned start of 12/2030. Of the 10, 2 have not started approvals, 1 has approvals pending, 5 are under construction and 2 are built but not yet operating. They join the grids run by APS (7), Salt River Project (2) and DOPD (1). Arizona Public Service Co owns the most plants here (2 of 10); 9 owners appear in all. Planned start dates run from 9/2026 to 12/2030.
A listing means an owner reported plans to EIA; plans change, and the planned date is the owner's own estimate.
Scroll the table sideways to see every column.
| Plant and owner | Type | MW | Stage | Planned start iThe month and year the owner told EIA it plans to begin operating. Owners change these dates often. |
|---|---|---|---|---|
| Desert BloomRE Desert Bloom LLC · DOPD | Battery storage | 150 | Built; not yet operating | 9/2026 |
| AgaveArizona Public Service Co · AZPS | Battery storage | 150 | Built; not yet operating | 10/2026 |
| Maricopa SolarMaricopa Solar · AZPS | Battery storage | 550 | Under construction (up to half done) | 9/2026 |
| Red HawkArizona Public Service Co · SRP | Gas (combustion turbine) | 392 | Under construction (up to half done) | 10/2027 |
| Romero Energy CenterRomero Energy Center, LLC · AZPS | Battery storage | 225 | Under construction (up to half done) | 6/2027 |
| Romero Energy Center II, LLCRomero Energy Center II, LLC · AZPS | Battery storage | 225 | Under construction (up to half done) | 6/2028 |
| White Tank Energy StorageWhite Tank Energy Storage LLC · AZPS | Battery storage | 100 | Under construction (up to half done) | 3/2027 |
| Desert Sand BESSDESA bn, LLC · AZPS | Battery storage + Solar | 600 | Approvals pending | 12/2028 |
| Saddleback Generation StationCopia Power · AZPS | Gas (combined cycle) | 1,250 | Planned; approvals not started | 12/2030 |
| Sierra Luna Energy StorageSierra Luna Energy Storage LLC · SRP | Battery storage | 150 | Planned; approvals not started | 12/2030 |
Source: U.S. Energy Information Administration, Form EIA-860M, August 2026 file, planned generators; utilities' own queues list many more requests. What the stages and grid codes mean.
What can Maricopa County require of a project?
Arizona has no state siting permit for solar, wind, or battery plants and no state decommissioning law, so Maricopa County's own zoning sets most of the rules; a transmission line of 115 kV or more needs a state certificate (state rules).
County rules and recent actions: On December 10, 2025, the Board of Supervisors approved a zoning ordinance update, effective January 9, 2026, that adds definitions for emerging technologies including battery energy storage systems. (Maricopa County zoning ordinance; county announcement)
Property taxesState trust landWater
Who to contact in Maricopa County
Maricopa County websiteAssessorPlanning and zoningFlood control district
Solar for homes and businesses in Maricopa County
Arizona's export rates, HOA rules, and tax breaks for rooftop and on-site solar are set statewide and by your utility, not by the county: Arizona home and business solar rules · utility application links.
State and federal reviews
ADEQ stormwater coverage, Arizona Game and Fish review, historic preservation consultation, and federal wildlife screening can apply to a site in Maricopa County: Arizona agency list.
Get the land report for a spot
Flood zone, wetlands, nearest power line, soils, and more for any point. Parcel acreage fills in automatically in Texas and 26 other states (not Arizona, which has no statewide parcel layer).