Comments by "Joe R M" (@joermnyc) on "How the world's first sand battery stores green power - BBC News" video.

  1. Converting heat to electricity requires thermocouples, and it’s not very efficient. (Spacecraft and the most recent Mars probes are powered this way, (Radio-Thermal Genertor, or RTG) but the heat source is a stack of glowing hot plutonium pucks.)
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