Seattle City Light 2016 ANNUAL REPORT | Supplementary Information 89 POWER (Unaudited) 2016 USES OF POWER GENERATED Boundary Skagit Cedar Falls & South Fork Tolt TREATY PURCHASED BPA Other BC Hydro SERVICES Non–residential Residential OTHER Wholesale & Other Seattle City Light Operations /Losses (in percent megawatt hours) (in percent megawatt hours) 2016 SOURCES OF POWER 8.4% 29.3% 46.6% 4.7% 22.7% 26.0% 38.7% 0.9% 2.4% 20.3%