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Solar Star

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Solar Star
NameSolar Star
LocationRosamond, California, United States
Coordinates34.8039°N 118.1949°W
StatusOperational
Commissioned2015
OwnerBerkshire Hathaway Energy (formerly SunPower partnership)
Land area3,200 acres
Capacity579 MW_AC (approx.)
TechnologyPhotovoltaic (crystalline silicon), single-axis trackers

Solar Star

Solar Star is a large utility-scale photovoltaic power station located in Rosamond, Kern County, California, United States. It was one of the world’s largest solar photovoltaic installations at the time of commissioning and played a prominent role in demonstrating utility-scale photovoltaics deployment in the American Southwest. The project involved major participants from the solar energy industry, regional regulators in California Public Utilities Commission, and national transmission planners such as the California Independent System Operator.

Overview

Solar Star consists of multiple contiguous arrays sited on arid land in the Mojave Desert near the Antelope Valley and the city of Lancaster, California. The facility was developed to supply low-carbon electricity to retail utilities under long-term power purchase agreements with entities including Pacific Gas and Electric Company and Southern California Edison. The project’s scale required coordination with the Western Electricity Coordinating Council for interconnection studies and with state agencies implementing California Renewables Portfolio Standard policies. Engineering and procurement involved contractors from the solar manufacturing and construction sectors.

History and Development

Initial proposals for the project were advanced by developers such as SunPower Corporation and later transactions involved investors including Berkshire Hathaway Energy and construction partners from the utility-scale solar sector. Permitting required approvals from the Kern County Board of Supervisors and environmental review under the California Environmental Quality Act. Project finance drew on tax equity and debt markets influenced by rulings from the Internal Revenue Service and incentives under the Investment Tax Credit (United States). Commercial operation milestones occurred in stages across 2014–2015, and the project’s commissioning was reported alongside other large-scale projects such as Topaz Solar Farm.

Design and Technology

The design uses crystalline silicon photovoltaic modules mounted on single-axis trackers sourced from suppliers in the photovoltaic supply chain. Balance-of-system components included inverters, transformers, and medium-voltage switchgear from manufacturers active in the power electronics market. The site incorporated access roads, electrical collection systems, and substations interfacing with Southern California Edison transmission lines. Civil and engineering works followed standards set by organizations such as the Institute of Electrical and Electronics Engineers for grid connection and by the National Electrical Code for on-site installations.

Capacity and Performance

Originally rated at approximately 579 MW_AC (roughly 707 MW_DC nameplate depending on module rating), the facility was capable of producing several hundred gigawatt-hours annually depending on solar irradiance and curtailment by the California Independent System Operator. Performance metrics were tracked for capacity factor, availability, and degradation rates using asset-management platforms from companies in the energy software market. Seasonal variability, dust soiling from the Mojave Desert, and scheduling with the California Independent System Operator affected output. The plant contributed to regional reliability efforts coordinated with entities like the California Energy Commission.

Environmental and Economic Impact

Environmental assessments examined potential effects on local habitats, including species monitored by the California Department of Fish and Wildlife and federally listed species under the Endangered Species Act jurisdiction of the U.S. Fish and Wildlife Service. Mitigation plans addressed land-use impacts, cultural resources overseen by the California Office of Historic Preservation, and water use considerations relevant to the Antelope Valley. Economically, the project generated construction jobs tracked by the Bureau of Labor Statistics and provided longer-term operations positions regulated by state labor laws. Its contribution to renewable energy deployment intersected with California climate policy goals and influenced procurement strategies used by utilities like Southern California Edison.

Ownership and Operations

Ownership and asset-management arrangements involved corporate entities such as SunPower Corporation, investment vehicles related to Berkshire Hathaway Energy, and tax equity partners from the financial services sector. Operations and maintenance were performed by specialized firms in the renewable energy services industry, coordinating with grid operators including Southern California Edison and the California Independent System Operator for dispatch and reliability obligations. Long-term revenue streams derived from power purchase agreements with utilities and from state incentives under the California Renewables Portfolio Standard.

Controversies around the project included debates during permitting over land-use change, environmental trade-offs raised in filings with the California Environmental Quality Act process, and concerns from local governments such as the Kern County Board of Supervisors about economic benefits and community impacts. Legal challenges and settlements touched on compliance with environmental mitigation commitments and contractual disputes typical of large infrastructure projects, occasionally involving state agencies like the California Public Utilities Commission and federal agencies such as the U.S. Fish and Wildlife Service.

Category:Solar power stations in California Category:Photovoltaic power stations Category:Buildings and structures in Kern County, California