| 221111 | Hydroelectric Power Generation | 312 |
| 221112 | Fossil Fuel Electric Power Generation | 282 |
| 221113 | Nuclear Electric Power Generation | 98 |
| 221114 | Solar Electric Power Generation | 2460 |
| 221115 | Wind Electric Power Generation | 187 |
| 221116 | Geothermal Electric Power Generation | 92 |
| 221117 | Biomass Electric Power Generation | 111 |
| 221118 | Other Electric Power Generation | 707 |
| 221121 | Electric Bulk Power Transmission and Control | 253 |
| 221122 | Electric Power Distribution | 1407 |
| 221210 | Natural Gas Distribution | 434 |
| 221310 | Water Supply and Irrigation Systems | 5760 |
| 221320 | Sewage Treatment Facilities | 271 |
| 221330 | Steam and Air-Conditioning Supply | 60 |
