| Value | Category |
|---|---|
| 01 | Electricity (Tanesco or Zeco) |
| 02 | Solar energy |
| 03 | Generator or private source |
| 04 | Gas (industrial) |
| 05 | Gas (biogas) |
| 06 | Electricity (wind) |
| 07 | Acetylene lamp |
| 08 | Kerosene (lantern or chimney) |
| 09 | Kerosene (wick lamps) |
| 10 | Candles |
| 11 | Firewood |
| 12 | Torch or rechargeable lamps |
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