Power, 
, refers to electrical power, and its primary purpose is to augment the Factory with an additional +50% 
. Dirty power is power produced from Coal, and causes 2 
in cities which have it. Clean power, when available, takes the place of dirty power, and has no unhealthiness associated with it.
Buildings Generating Power
| Building | Type of power |
|---|---|
| Coal Plant | Dirty |
| Shale Plant | Dirty |
| Hydro Plant | Clean |
| Nuclear Plant | Clean |
| The Three Gorges Dam World Wonder | Clean |