About Harquahala Sun

Harquahala Sun is a series of hybrid solar photovoltaic and battery storage power plants located in Harquahala Valley in west Maricopa county. Electricity generated by the power plants is transmitted via 500 kV transmission lines to the nearby Delaney substation, operated by Arizona Public Service (APS). The first phase utilized over 300 construction workers and began operation in 2024.

Ongoing Permitting

CEC Application - Phase IV - Harquahala North Transmission Line

As detailed in the Ten Year Plan submitted to the Arizona Corporation Commission, Copia Power is planning to submit an application for a Certificate of Environmental Compatibility for a transmission line in Maricopa County to interconnect new generation, load, and increase resiliency. This new project will expand upon the first three phases.

To learn about plans for Phase IV, please join one of our public meetings.

Community Meeting #1 (Virtual) - July 9, 2025 @ 2:30 PM MST
- https://us02web.zoom.us/j/82499127502 or
- +16694449171,,82499127502# US

Community Meeting #2 (In-Person) - July 16, 2025 @ 6:00 PM MST
- 49503 W Courthouse Rd Tonopah, AZ 85354

Maricopa County Comprehensive Plan

Maricopa County CPA Case # CPA250002 and ZC Case #Z250015 for the Harquahala Energy Generation and Industrial Campus

Comprehensive Plan Amendment (CPA) application to change the designated land from Rural Density Area to Utilities on 13 parcels and a Zone Change (ZC) application to change the overlay from Rural-43 to IND-2 IUPD on 19 parcels were submitted on April 17, 2025. 

A Technical Advisory Committee Meeting was held on May 20, 2025 to review comments on the Project application. The application resubmittal is currently under review and P&Z and BOS hearings are anticipated by late August and October, respectively and final approvals on the CPA, ZC and POD expected by December of 2025.

First Phase Benefits

  • Employment could peak at nearly 300 people during construction and ongoing jobs and local services will be required during operation.

  • Total investment in Harquahala Sun project facilities, infrastructure, wages and services is estimated to total over $350 Million.

  • The project will provide approximately $100 million in additional tax revenue to Maricopa County over its lifetime. These funds can be used to enhance local programs, schools, roads, and other county priorities

  • When built, the project will offset 146,000 tons of carbon dioxide emissions, equal to planting over 6.6 million trees or removing 1.1 million cars from the road for a year.

Completed Permitting

Maricopa County Comprehensive Plan Approved - Phase I

CEC Application - Phase I - Approved

On June 21, 2022, the Arizona Corporation Commission approved the Project’s Certificate of Environmental Compatibility (CEC) in Decision 78590. The CEC authorizes the construction of a collector substation and approximately 3.5 mile 500kV generation transmission which will connect the Project to the Delaney substation. The filed CEC application for the Project may be accessed here.

CEC Application - Phase II - Approved

On January 25, 2023, the Arizona Corporation Commission approved the Project’s Certificate of Environmental Compatibility (CEC) in Decision 78850. The CEC authorizes the construction of new 500 kV transmission lines with an approximate corridor length of 13 miles, together with associated 500 kV substations. The filed CEC application for the Project may be accessed here.

CEC Application - Phase III - Approved

An application for a Certificate of Environmental Compatibility (CEC) for the Project in Docket L-21304A-24-0098-00231 was filed on May 3, 2024. The Arizona Power Plant and Transmission Line Siting Committee held public hearings on June 17 and 18 at Hampton Inn & Suites - 2000 North Litchfield Rd, Goodyear, AZ 85395. Transcripts - Day 1, Day 2.

On August 13, 2024, the Arizona Corporation Commission approved the Project’s Certificate of Environmental Compatibility (CEC) in Decision 79467. The CEC authorizes the construction of a new 500 kV transmission line approximately 19 miles long and a switchyard extending transmission lines previously approved in Docket L-21185A-22-0072-00201 and Docket L-21185A-22-0273-00211.

Contact us

HarquahalaSun@copiapower.com
Attention: Garret Bean

24853 Del Prado
Dana Point, CA 92629