Three Sisters Solar Project
Please note that this website has been updated to reflect a change in the footprint of the proposed transmission corridor. See the “Recent Changes” section below.
Delivering valuable capacity to fast-growing Cochise County, Arizona
The BrightNight Three Sisters project will feature 300-megawatts (MW) of solar and 300MW / 1200MWh of battery storage. Located on 2,300-acres in Cochise County, Arizona, this dispatchable power project will provide valuable capacity and economic investment to the region and its energy users. Also, it’s infrastructure will operate without added burden to public systems such water and roads.
Of clean, renewable energy
Total economic investment over the life of the project
In tax revenue over the life of the project
In direct economic output during construction
Construction jobs and 3-5 permanent O&M careers
In local labor income during construction
There has been a change in the footprint of the proposed transmission corridor.
This change is due to interest BrightNight has received from manufacturers in potentially co-locating a green hydrogen manufacturing facility with the solar project. In order to serve this potential opportunity, additional transmission infrastructure is necessary beyond what has been communicated to date. The additional 230-kV infrastructure and substation equipment would be required to service the manufacturer’s load. This equipment would be located in the Facility Siting Area, as shown in the two maps below. Additional information about the equipment located in the Facility Siting Area is provided below the maps.
Within the Project Substation and Facility Siting Area, the following equipment and features may be included:
- Project Substation: A new Project Substation located within the dashed line, which will serve to step up power from the Three Sisters Solar Facility to 230 kV transmission voltage for delivery to the grid and/or the local hydrogen manufacturing facility.
- Behind the Meter (BTM) Service Line: A 230 kV transmission line from the new Project Substation to a new hydrogen production and liquefaction facility also located within the Facility Siting Area, and
- BTM Electrolyzer Substations (BTM Substations): The hydrogen production and liquefaction facility will include up to eight electrolyzers, each of which includes a 230 kV to 34.5 kV transformer (located downstream from the Project Substation) to step down power from transmission voltage to serve the green hydrogen facility. These BTM Electrolyzer Substations would also be located within the Project Substation and Facility Siting Area.
Project Events & Documents
- Application for Certificate of Environmental Compatibility + Exhibits
- Folleto de aviso público
- Feb. 27 – Mar. 1 – Certificate of Environmental Compatibility (CEC) Line Siting Hearing
- Feb. 27, 5:30- 6:30PM – CEC Hearing public comment period; The Willcox Community Center; 312 W Stewart St, Willcox, AZ 85643
- Prefiling Conference – The Arizona Power Plant and Transmission Line Siting Committee
- Gen-Tie Route Tour, Feb. 28, 9AM – Please refer to this route guide and map for details of the planned gen-tie route tour.
- Pre-Conference Hearing – CEC Pre-Conference Hearing documentation for the Three Sisters gen-tie proposal
- Community Notice – Informational notice distributed to project community members
- Three Sisters CEC Hearing Transcript – Feb. 27, 2023 – Transcript of testimony provided on Day 1 of the Three Sisters CEC hearing for the proposed project gen-tie
- Three Sisters CEC Hearing Transcript – Feb. 28, 2023 – Transcript of testimony provided on Day 2 of the Three Sisters CEC hearing for the proposed project gen-tie.
Three Sisters Community Notice
Thanks to exciting renewable energy adoption across the United States, most people are familiar with the benefits of solar power. But how it’s developed, constructed, and maintained is complex. We’ve compiled a few FAQs to help address your questions.
Talk to the Three Sisters Team
If you’re interested in learning more about this project, our team can provide the latest information on project permitting and construction.
ContactRon KiecanaChief Development Officer
ContactErik EllisVice President of Development