How Solar Thermal Storage Works: Concentrated Solar Plants Delivering 1,100 MWh Per Day

Concentrated solar power plants pair mirrors with thermal storage so they can keep generating after the sun goes down. This explainer looks at one large solar thermal storage tank that holds enough stored sunlight to deliver 1,100 MWh per day. That stored heat covers the five to seven hour evening peak, which is the main gap that plain solar farms cannot fill without batteries. Thermal storage is cheaper than battery storage over long durations, which makes it a practical option for grid operators who need dispatchable renewable energy. The tradeoff is that CSP needs direct sunlight and significant upfront capital, so it works best in high-irradiation regions. For anyone tracking grid decarbonization, this is the technology to watch for evening reliability.