Volcanic ash may hold the key to a revolution in solar energy storage

Volcanic ash may hold the key to a revolution in solar energy storage. This readily available and inexpensive material possesses properties ideal for storing thermal energy, a critical component in generating electricity from concentrated solar power (CSP). CSP systems use mirrors to focus sunlight onto a receiver, where it heats a fluid that can be stored and used to generate electricity when needed.

Currently, molten salts are used for thermal energy storage in CSP plants. However, they have drawbacks such as being corrosive and solidifying at lower temperatures. Researchers at the University of Barcelona discovered that volcanic ash can withstand temperatures exceeding 750°C, significantly higher than most molten salts. Furthermore, it remains stable after numerous heating and cooling cycles, making it a promising alternative for long-term energy storage.

Source: The Cool Down (https://www.thecooldown.com/green-tech/volcanic-ash-solar-energy-storage-system/)