Codes Titles Number of US Businesses
22 Utilities 34,810
221111Hydroelectric Power Generation 60
221112Fossil Fuel Electric Power Generation 121
221113Nuclear Electric Power Generation 29
221114Solar Electric Power Generation 357
221115Wind Electric Power Generation 191
221116Geothermal Electric Power Generation 112
221117Biomass Electric Power Generation 98
221118Other Electric Power Generation 13,709
221121Electric Bulk Power Transmission and Control 237
221122Electric Power Distribution 1,722
221210Natural Gas Distribution 3,219
221310Water Supply and Irrigation Systems 12,706
221320Sewage Treatment Facilities 1,879
221330Steam and Air-Conditioning Supply 370