Killington gives an overview of how the Cow Power program works:
Farms collect cow manure throughout the day, mixing it with wash water from the milking equipment which is then pumped into an anaerobic digester. The slurry flows through a digester for about three weeks at 100 degrees Fahrenheit allowing bacteria to convert the manure into biogas, about 60% methane gas and 40% carbon dioxide. The biogas is then delivered to a modified natural gas engine, which drives an electric generator to create electricity. Finally, the energy generated is fed onto the GMP electrical system which ultimately powers the K-1 Express Gondola.
Cue jokes about the Beast of the East now... Or, if you're not a fan of the mountain, the quality of the terrain served by that lift.