Comment Snow powered engine? (Score 1) 32
Either they are running a turbine or engine on CO2 snow, or they are burning natural gas to get the supercritical CO2 fully vaporized.
You have seen what happens when a CO2 fire extinguisher discharges, right?
Compressed air storage has the same problem but less so. Expanding air is cold and you get much lower pressure than expected. So they reheat it with a natural gas burner.