Ivanpah will stay open after CPUC reversal, but Mojave Desert solar plant raises hard questions about wildlife, costs and “clean” energy
The Ivanpah Solar Electric Generating System in California’s Mojave Desert will remain operational after a CPUC reversal, despite long-standing concerns over efficiency, bird mortality, reliance on natural gas startups, high costs, and its role in state grid reliability.
- Operational reversal: The California Public Utilities Commission decided Ivanpah is still needed for grid reliability, reversing planned closures.
- Environmental trade-offs: Concentrated solar flux has caused documented bird mortality and draws scrutiny from wildlife advocates.
- Fossil fuel dependence: Daily natural gas startups and no long‑duration thermal storage complicate claims the plant is wholly “clean.”
- Economic context: Large federal subsidies helped build the plant, but PV plus batteries have since undercut its per‑megawatt economics.
What is Ivanpah and where is it located?
Ivanpah Solar Electric Generating System is a concentrated solar power (CSP) facility with a gross capacity of 392 MW. The project occupies roughly 3,500–4,000 acres in the Mojave Desert near the California–Nevada border. For project background see the Ivanpah Solar Power Facility summary and the DOE project page.
How Ivanpah works — the tech behind the towers
Ivanpah uses power‑tower CSP technology. More than 173,500 heliostats (mirrors) track the sun and direct concentrated beams at boilers atop three 459‑foot towers. The boilers heat water into steam that spins turbines to generate electricity. The plant was built using BrightSource Energy’s design and reached full operation in 2014 after staged start‑ups beginning in 2013.
Because heliostats focus sunlight into small areas, temperatures at the focal points can be extremely high. That concentration increases operational efficiency but also creates hazards for wildlife that cross beam paths.
Environmental trade-offs: solar flux and wildlife impacts
A persistent controversy has been harm to wildlife from intense solar flux. Bright, glowing areas near the towers attract insects, which in turn attract birds at dusk and dawn. When birds enter concentrated beams they can be injured or killed by extreme heat. Federal monitoring and reporting have documented thousands of bird deaths at Ivanpah since it opened.
“Researchers and wildlife advocates say the problem is not limited to small numbers and that the plant’s design creates a new kind of hazard in a desert environment that supports important bird species and migratory pathways.”
Operators and regulators have adjusted monitoring and some operational practices, but bird mortality remains a public concern tied directly to the plant’s core technology.
Natural gas use, emissions and “clean” credentials
Ivanpah lacks long‑duration thermal storage. To bring boilers to operating temperature each morning, the plant uses natural gas–fired auxiliary boilers. Critics note that daily gas startups produce tens of thousands of metric tons of CO₂ per year, complicating simple claims of zero emissions.
Supporters point to lifecycle analyses that estimate the plant avoids large amounts of greenhouse gases versus fossil generation over its lifetime. Still, onsite fossil fuel use for startup and limited dispatchability mean Ivanpah’s emissions profile is more complex than that of the newest PV‑plus‑storage projects.
Costs, subsidies and the federal role
Ivanpah was built with significant public support: more than $1.6 billion in DOE loan guarantees and a $539 million U.S. Treasury grant (about 30% of construction). Those subsidies made the high‑profile project possible, but as utility‑scale PV and batteries became cheaper, Ivanpah’s per‑megawatt costs and electricity prices fell behind modern alternatives.
That economic gap fueled debate about whether to continue operating the plant, especially as lower‑cost technologies that avoid the plant’s environmental downsides became widely available.
Performance, shutdown plans and the CPUC reversal
After initial ramp‑up problems, Ivanpah met many contractual delivery targets in later years. Still, operating economics remained pressured compared with PV plus storage. In January 2025 owners announced plans to end power purchase agreements for two units and begin staged closures in 2026, pending regulator approval.
Federal officials reportedly supported shutting the facility because of cost and environmental concerns. However, the California Public Utilities Commission reversed the planned closures, finding the plant is still needed for grid reliability — a decision that preserves capacity but keeps controversies alive.
Implications for San Diego, California
Economic impact: San Diego ratepayers and taxpayers have a stake in statewide energy investments. Federal backing and continued operation of Ivanpah influence debates over how public funds are used in the energy transition and may affect procurement choices and future rate pressure.
Grid reliability and supply: Even if Ivanpah does not directly serve San Diego, capacity decisions affect the California Independent System Operator’s balancing zone. CPUC’s decision reflects concern that retiring capacity too quickly could create shortfalls during heat waves or wildfire seasons.
Environmental and social concerns: Local residents and conservation groups value open space and bird habitats. Documented bird mortality and desert land conversion raise questions about mitigation and monitoring requirements for all utility‑scale projects.
Political consequences: The reversal will feed local and state debates on retiring older renewable projects versus keeping them for reliability while managing conservation priorities.
Practical effects: In the near term, keeping Ivanpah online may help prevent outages during peak events; in the longer term, the situation could accelerate investments in lower‑cost PV and storage that alter how Southern California meets demand.
Reporting and oversight
Ivanpah remains a testing ground for assessing the full costs and benefits of large renewable projects. Regulators will weigh when to keep older, controversial plants online for reliability versus when to retire them in favor of cleaner, less harmful alternatives. Ongoing monitoring, transparent reporting and stronger mitigation measures are likely to be central to future oversight.
Sources and monitoring
Key public sources and project materials include:
- Ivanpah Solar Power Facility (Wikipedia)
- DOE project page: Ivanpah
- Bechtel: Ivanpah project summary
- NRG: Exploring Ivanpah — its power and its people
- Environmental Leader: Ivanpah shutdown coverage
- Stanford course material: lifecycle analysis reference
- Energy Monitor: Ivanpah project overview
Ivanpah’s future will hinge on balancing reliability, costs, emissions and ecosystem protection — a debate that matters for San Diego ratepayers, statewide energy planners and the species that share California’s deserts.
