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| Solar One | |
|---|---|
| Name | Solar One |
| Country | United States |
| Location | Daggett, California |
| Status | Decommissioned |
| Construction began | 1974 |
| Commissioned | 1982 |
| Decommissioned | 1986 |
| Owner | United States Department of Energy |
| Operator | Southern California Edison |
| Solar type | Solar thermal power tower (experimental) |
| Heliostats | 1818 |
| Capacity mw | 10 |
Solar One
Solar One was an early commercial-scale solar thermal power tower demonstration project located near Daggett, California in the Mojave Desert. Funded by the United States Department of Energy and operated by Southern California Edison, it sought to validate technologies for concentrating solar power and to bridge research from institutions like Sandia National Laboratories to utility-scale deployment. The project informed later initiatives such as the Solar Two retrofit and influenced private-sector developments including facilities by BrightSource Energy and Abengoa Solar.
Solar One was a central receiver system that used a field of heliostats to concentrate sunlight onto a receiver atop a tower, producing high-temperature heat to generate steam for a turbine. The project combined hardware and systems engineering contributions from contractors such as Bechtel, United Technologies, and vendors linked to General Electric turbine technology. Located near Barstow, California and the Mojave National Preserve, the site capitalized on high direct normal irradiance and proximity to regional transmission owned by Southern California Edison and Pacific Gas and Electric Company interconnection infrastructure.
Initial conceptual work traced to research programs at Sandia National Laboratories and the National Renewable Energy Laboratory predecessor activities in the 1960s and 1970s. Congressional authorization and appropriations through the Energy Research and Development Administration and later the United States Department of Energy enabled contracts awarded in the mid-1970s to industrial partners including Bechtel National, Inc. and subcontractors drawn from the Aerospace Corporation and Lawrence Livermore National Laboratory. Groundbreaking occurred in 1974 with phased construction, fielded testing, and commissioning culminating in 1982. Operational shortcomings and shifting federal priorities following policy debates in the Reagan administration led to project wind-down and conversion to the Solar Two molten-salt experiment in the early 1990s.
The Solar One plant featured approximately 1,818 heliostats mounted on two-axis tracking structures supplied by contractors with heritage in aerospace and heavy industry. Heliostats focused concentrated solar radiation onto a receiver mounted at the top of a roughly 90-meter tower platform engineered by Bechtel. The thermal system produced steam for a nominal 10-megawatt turbine-generator set based on designs licensed from General Electric and auxiliary systems from Westinghouse Electric Company. The plant employed heat transfer via oil as the primary working fluid in the receiver loop, leveraging knowledge from heat-transfer research at Sandia National Laboratories and materials testing at Oak Ridge National Laboratory. Control systems integrated supervisory designs influenced by instrumentation platforms developed at Lawrence Berkeley National Laboratory and telemetry standards used in NASA solar thermal testbeds.
During its operational life, Solar One demonstrated the operational viability of heliostat field alignment, solar flux management, and remote diagnostics under desert conditions. Performance metrics documented by the United States Department of Energy and academic partners at California Institute of Technology and Stanford University included solar-to-electric conversion efficiencies, heliostat tracking error statistics, and receiver thermal stresses. Operational challenges included thermal degradation of heat transfer fluids, particulate erosion from desert winds, and optics soiling addressed in collaboration with researchers from Jet Propulsion Laboratory and materials scientists at Massachusetts Institute of Technology. Peak output approached the 10-megawatt design in high insolation periods, but capacity factors were constrained by diurnal variability and seasonal cloud patterns affecting the Mojave Desert site.
Environmental assessments considered impacts on desert flora and fauna within the Mojave Desert ecosystem and on avian species studied by teams from University of California, Davis and Point Reyes Bird Observatory. Land-use trade-offs were evaluated alongside water-use analyses referencing standards from Environmental Protection Agency guidance for arid-region power plants. Solar One's oil-based thermal loop posed risks of fluid leakage; mitigation measures and contingency planning involved protocols adopted from United States Environmental Protection Agency spill response frameworks and lessons applied in later projects by Abengoa Solar and BrightSource Energy. The project's legacy included improved lifecycle analyses used by International Energy Agency working groups and sustainability criteria incorporated into National Renewable Energy Laboratory deployment toolkits.
Solar One served as an inflection point linking government-sponsored research to commercial concentrating solar power ventures. Its data and operational experience informed the Solar Two molten-salt conversion, subsequent utility-scale towers by BrightSource Energy at Ivanpah Solar Electric Generating System proponents, and design standards adopted by international firms such as Acciona and ACWA Power. Academic publications from collaborators at Stanford University, MIT, and Caltech influenced receiver materials research, heliostat cost-reduction strategies, and system integration practices that underpin modern concentrating solar power plants across Spain, South Africa, and the United Arab Emirates. Lessons on thermal storage, flux management, and siting fed into policy dialogues at the Department of Energy and the International Renewable Energy Agency, shaping incentives and research priorities for the next-generation solar industry.
Category:Solar thermal power stations in the United States