| | | 221 | Utilities | 3 | | | | Utilities 221 | Utilities 22 |
| | | 2211 | Electric Power
Generation, Transmission
and Distribution | 4 | | | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 22111 | Electric Power Generation
| 5 | | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221111 | Hydroelectric Power
Generation | 6 | Hydroelectric Power
Generation 221111 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221112 | Fossil Fuel Electric
Power Generation | 6 | Fossil Fuel Electric
Power Generation 221112 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221113 | Nuclear Electric Power
Generation | 6 | Nuclear Electric Power
Generation 221113 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221114 | Solar Electric Power
Generation | 6 | Solar Electric Power
Generation 221114 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221115 | Wind Electric Power
Generation | 6 | Wind Electric Power
Generation 221115 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221116 | Geothermal Electric Power
Generation | 6 | Geothermal Electric Power
Generation 221116 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |
| | | 221117 | Biomass Electric Power
Generation | 6 | Biomass Electric Power
Generation 221117 | Electric Power Generation
22111 | Electric Power
Generation, Transmission
and Distribution 2211 | Utilities 221 | Utilities 22 |