| Naics index | Naics index description |
|---|---|
| 221114 | Power generation, solar electric |
| 221114 | Solar farms |
| 221115 | Electric power generation, wind |
| 221115 | Power generation, wind electric |
| 221116 | Electric power generation, geothermal |
| 221116 | Geothermal electric power generation |
| 221116 | Power generation, geothermal |
| 221117 | Biomass electric power generation |
| 221117 | Electric power generation, biomass |
| 221117 | Power generation, biomass |