North American Industry Classification System (NAICS) 2002
- 22 - Utilities
- 221 - UtilitiesUS
- 2211 - Electric Power Generation, Transmission and DistributionUS
- 22111 - Electric Power GenerationUS
- 221111 - Hydro-Electric Power GenerationUS
- 221112 - Fossil-Fuel Electric Power GenerationUS
- 221113 - Nuclear Electric Power GenerationUS
- 221119 - Other Electric Power GenerationUS
- 22112 - Electric Power Transmission, Control and DistributionUS
- 221121 - Electric Bulk Power Transmission and ControlUS
- 221122 - Electric Power DistributionUS
- 2212 - Natural Gas DistributionUS
- 22121 - Natural Gas DistributionUS
- 221210 - Natural Gas DistributionUS
- 2213 - Water, Sewage and Other SystemsUS
- 22131 - Water Supply and Irrigation SystemsUS
- 221310 - Water Supply and Irrigation SystemsUS
- 22132 - Sewage Treatment FacilitiesUS
- 221320 - Sewage Treatment FacilitiesUS
- 22133 - Steam and Air-Conditioning SupplyUS
- 221330 - Steam and Air-Conditioning SupplyUS
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