The Solar Energy Technologies Office (SETO) supports research and development of concentrating solar power (CSP) technologies that reduce the cost of solar energy. CSP works to develop systems that can supply solar power on demand, even when there is no sunlight, through the use of thermal storage. Since 2011, the levelized cost of electricity for CSP has decreased about 36 percent, from $0.21 cents per kilowatt hour to $0.12 cents per kilowatt hour, already over half of the way toward achieving the SunShot goal of $0.06 per kilowatt hour.
Approximately 1.8 gigawatts of CSP are connected to the grid, including more than 767 megawatts from Ivanpah, Genesis Solar’s second phase, and Abengoa’s Mojave Solar, all of which came online in 2014. SolarReserve’s 110 MW Crescent Dunes came online in late 2015 and is the largest molten-salt power tower CSP plant in commercial operation in the world.
Research and Development
SETO supports the development of novel CSP technologies that will lower cost, increase efficiency, and improve reliability compared to current state-of-the-art technologies. These projects explore new concepts explore new operation system designs and innovative concepts in the collector, receiver, thermal storage, heat transfer fluids, and power cycle subsystems, advancing the state-of-the-art. The CSP subprogram is most interested in transformative concepts with the potential to break through existing performance barriers, such as efficiency and temperature limitations.
The National Renewable Energy Laboratory developed the Concentrating Solar Power Gen3 Demonstration Roadmap to address and prioritize research and development gaps for CSP technology. This laid the groundwork for the Gen3 CSP funding opportunity. See the Gen3 CSP selections.
DOE provides funding through competitive awards to industry, national laboratories, and universities with the shared goal of making large-scale dispatchable solar energy systems cost competitive without subsidies by 2020.
Concentrating Solar Power 101
CSP technologies use mirrors to reflect and concentrate sunlight onto receivers that collect solar energy and convert it to heat. Thermal energy can then be used to produce electricity via a turbine or heat engine driving a generator. Because CSP technologies collect solar energy and convert it to thermal energy that can be stored before powering a generator, they can be used either as a flexible provider of electricity, such as a natural gas “peaker” plant, or as a baseload source of electricity similar to a traditional nuclear or coal plant. CSP can also be deployed as fossil-fuel backup/hybridization that allows existing fossil fuel projects to run cleaner while operating at the same or lower cost. In the United States alone, between 11 and 21 gigawatts of CSP could be built and integrated into existing fossil fuel plants in the United States to reduce their carbon emissions – that’s enough electricity to power to between 3 million and 6 million homes.
CSP Success Stories
The same visionary scientists responsible for pioneering space exploration are also behind a national effort to commercialize concentrating solar...Learn More
Supercritical carbon dioxide (sCO2) power cycles have the potential to reduce the cost of concentrating solar power (CSP) by substantially...Learn More
Next generation concentrating solar power (CSP) system designs use supercritical carbon dioxide (sCO2) turbine power cycles to more efficiently...Learn More
One of the biggest challenges of large-scale deployment of solar energy is figuring out how to use it after the sun sets. SunShot Initiative...Learn More
Sometimes great things come in small packages. In the case of developing ways to more efficiently store solar energy, they come in tiny capsules....Learn More