Qnergy is finally making Stirling engines a commercial success, not by competing with diesel on cost or efficiency, but by selling sealed, maintenance-free engines for remote oil and gas sites, methane-venting pneumatics and closed landfills where uptime and dirty fuels matter most. A deep dive into how free-piston Stirlings work, why they took 200 years to find a market, and why the business survived the repeal of the regulations meant to drive it.
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