Turbomachinery systems, comprised primarily of turbo-expanders, air or gas compressors, electric motors not for land vehicles, and gas- or steam-operated or electric generators for the purpose of compressed air energy storage; turbomachinery systems, comprised primarily of turbo-expanders, air or gas compressors, electric motors not for land vehicles, and gas- or steam-operated or electric generators for the purpose of storage and retrieval of off-peak power; turbomachinery systems, comprised...