| Value | Category |
|---|---|
| 1 | Electrical energy |
| 2 | Natural gas |
| 3 | Gas in cylinder or tank |
| 4 | Petroleum, gasoline, kerosene, alcohol |
| 5 | Firewood, wood, discarded materials, vegetable coal |
| 6 | Mineral coal |
| 8 | Unknown |
| 9 | NIU (not in universe) |
| var_concept.title | Vocabulary |
|---|---|
| Utilities Variables -- HOUSEHOLD | IPUMS |