Codes Titles Number of US Businesses
22 Utilities 35,008
221111Hydroelectric Power Generation 63
221112Fossil Fuel Electric Power Generation 124
221113Nuclear Electric Power Generation 30
221114Solar Electric Power Generation 384
221115Wind Electric Power Generation 189
221116Geothermal Electric Power Generation 112
221117Biomass Electric Power Generation 99
221118Other Electric Power Generation 13,660
221121Electric Bulk Power Transmission and Control 237
221122Electric Power Distribution 1,700
221210Natural Gas Distribution 3,331
221310Water Supply and Irrigation Systems 12,838
221320Sewage Treatment Facilities 1,873
221330Steam and Air-Conditioning Supply 368