Ivanpah Solar Power Facility

Ivanpah Solar Power Facility
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Name	Ivanpah Solar Power Facility
Location	San Bernardino County, California
Coordinates	35, 34, N, 115...
Owner	BrightSource Energy, NRG Energy, Google
Status	Operational
Construction began	2010
Commissioned	2014
Cost	~$2.2 billion
Solar farm type	CSP
Turbine manuf	Siemens
Ps electrical capacity	377 MW (net)

Ivanpah Solar Power Facility is a concentrated solar thermal power plant located in the Mojave Desert of San Bernardino County, California. It was developed by BrightSource Energy and constructed by Bechtel, becoming operational in 2014. The facility utilizes a field of computer-controlled mirrors, called heliostats, to focus sunlight on centralized power towers, generating steam to drive Siemens turbines. As one of the world's largest solar thermal power stations, it represents a significant investment in renewable energy in the United States.

Overview

The project is situated on approximately 3,500 acres of federal land managed by the Bureau of Land Management near the California–Nevada border. It was developed through a partnership between BrightSource Energy, NRG Energy, and Google, with significant loan guarantees from the United States Department of Energy. The facility's construction and operation required extensive environmental review and permitting processes overseen by the California Energy Commission and other regulatory bodies. Its location on Ivanpah Dry Lake was chosen for its high solar irradiance, critical for the efficiency of concentrated solar power technology.

Technology and design

Ivanpah employs a power tower design, a type of concentrated solar power technology distinct from photovoltaic systems. The plant consists of three separate units, each with its own central tower and a surrounding field of over 170,000 dual-axis tracking heliostats. These mirrors focus concentrated sunlight onto a boiler atop a 459-foot tower, heating water to create high-temperature superheated steam. This steam is then piped to a conventional steam turbine generator located at the base of each tower. A key design feature is the use of natural gas-fired auxiliary boilers to preheat the system each morning and maintain steam during cloud cover, ensuring grid reliability as mandated by the California Independent System Operator.

Environmental impact and controversies

The project's environmental review, conducted under the National Environmental Policy Act, identified significant impacts on the local desert tortoise population, a species listed as threatened under the Endangered Species Act. Mitigation measures, including costly relocation efforts overseen by the United States Fish and Wildlife Service, were implemented. The facility has also been criticized for its high water usage in an arid region and for causing avian mortality due to intense solar flux, leading to investigations by state and federal wildlife agencies. These issues sparked opposition from conservation groups like the Sierra Club and the Center for Biological Diversity, highlighting the trade-offs between large-scale renewable energy development and ecosystem conservation in fragile desert habitats.

Operations and performance

Since its commissioning, Ivanpah has supplied electricity under long-term power purchase agreements with Pacific Gas and Electric Company and Southern California Edison. Initial operational performance fell short of projected net output, leading to technical adjustments and a renegotiation of its federal loan terms with the United States Department of Energy. Performance is highly dependent on direct normal irradiance and has been affected by regional weather patterns and occasional curtailment orders from the California Independent System Operator. The plant's output contributes to meeting the renewable portfolio standard mandates set by the California Public Utilities Commission.

Ownership and economics

The project is jointly owned by NRG Energy, BrightSource Energy, and Google, with NRG Energy serving as the managing member. The total construction cost was approximately $2.2 billion, supported by a $1.6 billion loan guarantee from the United States Department of Energy's Loan Programs Office. The financial structure relies on revenue from the power purchase agreements, investment tax credits, and other incentives for renewable energy. The economic viability of the plant has been a subject of analysis, with debates centering on the levelized cost of energy compared to other technologies like photovoltaics and wind power. Category:Solar power stations in California Category:Buildings and structures in San Bernardino County, California Category:Solar power in the United States