98% [1] For all practical purposes the electricity here is 100% clean except for emissions occurring during construction. Huge concrete dams add quite a bit of

98% [1] For all practical purposes the electricity here is 100% clean except for emissions occurring during construction. Huge concrete dams add quite a bit of CO2 to the atmosphere when curing. [1] https://en.wikipedia.org/wiki/Electricity_sector_in_Norway https://en.wikipedia.org/wiki/Electricity_sector_in_Norway