Personally I think storage using hot rocks is going to be a big deal in the next 10 years. https://www.asme.org/topics-resources/content/heated-volcanic-rocks-

Personally I think storage using hot rocks is going to be a big deal in the next 10 years. https://www.asme.org/topics-resources/content/heated-volcanic-rocks-store-energy https://www.asme.org/topics-resources/content/heated-volcani...