30/09/2026
In Guazhou county of Northwest China's Gansu province, a solar thermal energy storage power station can generate power for 24 hours nonstop.
Its main project has begun commissioning and will be put into operation by the end of this year, according to the China Three Gorges Corporation.
The solar thermal energy storage power station can generate electricity with or without direct sunlight, thanks to heliostats and molten salt, while achieving stable all-day power output.
Two adjacent heat-absorbing towers, sharing one turbine generator, are settled in the power station. Beneath the towers, heliostat arrays are installed, covering a lighting area of 800,000 square meters. Notably, the heliostats can pivot and follow the direction of sunlight, like a sunflower tracking the sun through the course of the day.
A new 100-megawatt solar thermal power station in northeast China has started generating electricity, marking an important step in expanding concentrated solar power into colder, high-latitude regions. Unlike standard solar panels that produce electricity directly, this system uses mirrors to concentrate sunlight and produce heat, which is then used to generate power. The project is designed to improve reliability in regions where sunlight varies and temperatures are low.
The key mechanism is thermal storage using molten salt. Sunlight is concentrated to heat the salt to very high temperatures, where the energy is stored as heat rather than being used immediately. This hot salt can later release its heat to produce steam, which drives a turbine to generate electricity. Because heat can be stored, the plant can continue producing power even when the sun is not shining, making the system more stable than traditional solar panels.
This matters because it solves one of the biggest limitations of solar energy—intermittency. By converting sunlight into stored thermal energy, the system can deliver electricity on demand, not just during daylight hours. That makes it useful for balancing power grids, especially in regions that need reliable clean energy alongside wind and other renewables. It also shows how solar technology is evolving from simple generation into full energy storage systems that behave more like conventional power plants.