Start-ups are exploring heat storage with materials like salt, air, and bricks as a sustainable alternative to conventional batteries. This strategy helps manage the variability of renewable energy and makes use of cheaper, off-peak electricity. Technologies such as molten salt tanks are being developed for storing industrial heat efficiently.

Thermal storage offers advantages like longer durability and fewer environmental impacts compared to chemical batteries. Initiatives by firms like Malta and Highview Power highlight the move towards thermal energy solutions to improve grid flexibility and facilitate the transition to clean energy, despite existing policy and commercial challenges. This shift represents a thoughtful approach in the evolution of energy storage technologies. — The Guardian