Codes Titles Number of US Businesses
22 Utilities 35,256
221111Hydroelectric Power Generation 61
221112Fossil Fuel Electric Power Generation 115
221113Nuclear Electric Power Generation 35
221114Solar Electric Power Generation 406
221115Wind Electric Power Generation 204
221116Geothermal Electric Power Generation 108
221117Biomass Electric Power Generation 96
221118Other Electric Power Generation 12,587
221121Electric Bulk Power Transmission and Control 259
221122Electric Power Distribution 2,570
221210Natural Gas Distribution 3,371
221310Water Supply and Irrigation Systems 13,214
221320Sewage Treatment Facilities 1,870
221330Steam and Air-Conditioning Supply 360