Storing wind, solar power with silica sands

NREL researchers developed a system that uses heated silica particles for thermal energy storage. The baseline technology is designed for a storage capacity of up to 26,000 MWh and is claimed to have a cost of of between $2 and $4 per kWh.Scientists from the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) have proposed to use silica sands - a stable and inexpensive material with prices ranging from $30 to $50/ton - as a medium to store excess wind and solar power. The research team developed a thermal energy storage technology called Economic Long-Duration Electricity ...

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