| Category - Utilities |
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| Sub-Categories |
| Electric Power Generation, Transmission and Distribution |
| Electric Power Generation |
| Hydroelectric Power Generation |
| Fossil Fuel Electric Power Generation |
| Nuclear Electric Power Generation |
| Other Electric Power Generation |
| Electric Power Transmission, Control, and Distribution |
| Electric Bulk Power Transmission and Control |
| Electric Power Distribution |
| Natural Gas Distribution |
| Natural Gas Distribution |
| Water, Sewage and Other Systems |
| Water Supply and Irrigation Systems |
| Sewage Treatment Facilities |
| Steam and Air-Conditioning Supply |
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