These processes require input to start up, but then become self-sustaining. See also:
https://en.wikipedia.org/wiki/Thermal_depolymerization.
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It’s about one-tenth the size of a steam turbine of comparable output, and has the potential to be 50 percent efficient at turning heat into electricity. Steam-based systems are typically in the mid-40 percent range; the improvement is achieved because of the better heat-transfer properties and reduced need for compression in a system that uses supercritical carbon dioxide compared to one that uses steam.
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