Power Production 90 percent 88% of the city’s electricity http://www.seattle.gov/light/FuelMix/ City Light's own homepage Seattle City Light | Fuel Mix http://www.seattle.gov/light/FuelMix/ 89 percent "Fuel Mix - How Seattle City Light electricity is generated" Power Production 90 percent 89 percent 89.8 percent came from hydro 89 percent fuel mix Seattle City Light | Fuel Mix 90 percent 88% of the city’s electricity Power Production 90 percent