Abstract
Concentrating solar technologies (CSTs) can provide both electricity and process heat on a commercial scale. Although ~6.7 GW of concentrating solar power plants have been installed worldwide, providing electricity at costs close to US$0.10 kWhe−1, deployment of CST has not grown at the same rate as photovoltaic technologies. In this Review, we summarize the current state of technology and discuss limitations and further developments to reduce the levelized cost of electricity and heat. Integrating CST with low-cost thermal energy storage permits dispatchable, on-demand energy, which can be supplied even at low sunlight or at night. CST systems for temperatures up to 565 °C are already commercially available and are used for electricity production as well as for industrial processes and district heating. The development of new receivers that operate with high-temperature heat transfer media such as molten sodium or ceramic particles or the combination with advanced heat cycles introduces the next generation of CST. This technology can supply process heat at temperatures of up to 1,500 °C, permitting applications in high-temperature mineral processing and chemical synthesis, which would otherwise be difficult to defossilize through electrification alone.
Key points
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Concentrating solar power plants are operating on commercial scales for renewable energy supply: equipped with thermal storage, the technology provides flexibility in low-carbon electricity and heat markets.
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Parabolic trough collectors are a mature solution providing utility-scale dispatchable heat and electricity from solar energy. Solar tower collectors have been deployed at utility scale, but further development is needed for reliable power generation and thermal energy storage.
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Intensified development towards higher concentration factors and high-temperature heat transfer media will help to further reduce levelized costs of electricity and heat.
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High-temperature heat transfer media offer the opportunity to defossilize hard-to-abate sectors by providing renewable heat at temperatures up to and above 1,000 °C, where technically feasible alternatives for the defossilization of industrial processes are rare.
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Development and application of international standards for the technology would derisk large-scale projects and encourage market growth.
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In electricity markets that remunerate benefits regarding power dispatchability, hybrid photovoltaic–concentrated solar power plants can realize their full economic potential by complementing each other.
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Glossary
- Conventional steam power cycle
-
A heat engine loop in which water is boiled and expanded into high-pressure steam, which then passes through a turbine to produce mechanical work. The steam is then condensed and pumped back to the boiler to enable continuous operation.
- Direct normal irradiance
-
(DNI). The flux of solar radiation per unit area received by a surface kept perpendicular to the sun’s rays, excluding the diffuse component from the sky.
- Supercritical CO2
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Carbon dioxide compressed above its critical point (31.1 °C, 7.38 MPa), where it forms a single dense fluid phase with liquid-like density and gas-like viscosity, making it an efficient working fluid for advanced power cycles.
- Thermal energy storage
-
(TES). A system that absorbs heat (or cold) when it is available and releases it later, thereby decoupling energy supply from demand in time.
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Stengler, J., Bülow, M. & Pitz-Paal, R. Concentrating solar technologies for low-carbon energy. Nat. Rev. Clean Technol. 1, 719–733 (2025). https://doi.org/10.1038/s44359-025-00096-4
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DOI: https://doi.org/10.1038/s44359-025-00096-4


