Top 5 Concentrated Solar Power (CSP) startups

Updated: Dec 08, 2025
|
Solar thermal energy (STE) create technologies for solar farms that use solar energy to generate thermal energy
1
Country: USA
SolarSpace is developing a next-generation concentrated solar power (CSP) technology developed at the University of Arizona's Steward Observatory Mirror Laboratory. Lightweight mirror technology enabled the creation of some of the world's largest mirrors (9.2 m²) that focus sunlight. At the focal point, light enters a small power conversion unit (PCU) through a spherical lens, where it is converted into electricity by small, highly efficient multi-junction solar cells. Patented optics deliver 1,000-fold concentrated sunlight to the cells, distributing it evenly among them, resulting in extremely high overall efficiency. Multiple mirror modules are mounted on a lightweight, dual-axis tracker and aimed directly at the sun, maximizing total power output from sunrise to sunset. SolarSpace has licensed the Transmission Energy Efficiency System (TREES) from NASA and signed a Space Act Agreement with NASA.
2
Country: Israel | Funding: $840.3M
BrightSource Energy develops OASES - AI-powered software for energy companies that allows to maximize the efficiency, reliability, and profitability of renewable energy generation and storage projects. It transforms distributed power plant operations, delivering higher productivity and long-term resilience, real-time plant monitoring, regulatory compliance, revenue optimization across multiple markets, provides real-time, day-ahead and intraday forecasting and trading data, ancillary services and distributed asset portfolio aggregation. The company has deployed its solutions in several major projects, including solar thermal plants in Israel, California, Dubai, and South Africa.
3
Country: USA | Funding: $332.6M
Heliogen is developing CSP technology that enables commercial replacement of fossil fuels in industrial processes with carbon-free, ultra-high-temperature solar thermal energy and the conversion of sunlight into fuels, including hydrogen, on large scale. Heliogen has built a Solar Thermal Energy Plant powered by advanced computing and mature low-carbon technologies in Lancaster. Its heliostat tracking and hybrid CSP+PV systems optimize solar energy production, while long-duration energy storage ensures on-demand high-capacity power. The company supplies thermal and electrical energy for industrial, utility and data center operations.
4
Country: Denmark
Aalborg CSP designs and supplies sustainable integrated solar energy systems, including high- and low-temperature energy storage systems, solar panels, heat pumps, boilers, integrated energy systems and customized Power-to-X solutions. The company has earned global leadership in CSP power plant projects. It develops parabolic trough and solar tower technology for industrial CSP applications that are an add-on to an existing energy source and can be applied to a range of applications, all essential for a wide range of industries. It matches individual energy needs with appropriate systems and technologies, integrating and combining solutions to achieve synergies across sectors and technologies.
5
Country: Germany
Everllence develops power plant engines, turbines, compressors that use climate-neutral fuels to reduce carbon emissions. Its energy solutions include Power-to-X technology that converts electricity into carbon-neutral synthetic fuels, heat pumps, energy storage (CAES, LAES & CO2 battery) and thermal power plants. Everllence is a one-stop shop for thermal power solutions – providing everything from planning to operation of power plants. Its solutions run on fossil fuels as well as renewables like solar power, biomass, waste and geothermal energy. The company also develops carbon capture and storage technologies to ensure that unavoidable carbon emissions can be extracted from industrial processes safely. Through its subsidiary Quest One the company manufactures electrolyzers for producing green hydrogen.
  See also:
Editor: Alexander Gillet
Alexander Gillet is a senior editor for EnergyStartups. He has a deep background in energy sector and startups. Alexander graduated from Emlyon Business School, a leading French business school specialized in entrepreneurship. He has helped several non-profit organizations dedicated to promoting environmental education and sustainability and has written over 250 articles on energy technology for various websites. In his free time, Alexander enjoys yoga, camping and exploring the Blue Ridge Mountains. You can contact Alexander at alexgillet(at)energystartups(dot)com