This French company uses glass fiber reinforced flywheels for energy storage instead of steel. Quote: << Gennesseaux went on to say. “We are around 10 grams of CO2 per kWh, while lithium-ion batteries are around 40g CO2/kWh, at the same level as steel flywheels.”>> Initially the flywheel will store 10 kWh. It’s buried underground. Steel
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In this article there is a link to the .PDF paper with the research and technical details. The sad story of Beacon which went bankrupt a year after completing the Stephentown flywheel storage farm, still operating. Now, Amber Kinetics is making small systems. I read about flywheel energy storage systems decades ago, the design concepts
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