Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90Seattle City Light 2015 Annual Report 81 CUSTOMER STATISTICS (Unaudited) Kilowatt hours used (in billions) Number of customers (in thousands) 2011 2012 2013 2014 2015 2011 2012 2013 2014 2015 RESIDENTIAL CONSUMPTION Kilowatt hours used (in billions) Number of customers (in thousands) NON-RESIDENTIAL CONSUMPTION * Note: Source of national data: Department of Energy (www.eia.doe.gov/electricity/annual/). 2015 National average annual consumption data and average rate data not available; Certain 2014-2011 National average annual consumption and National average rate data were updated with revised actuals. Effective 2013, allocation of net change in unbilled revenue excludes retail customer voluntary payments for conservation and solar energy. Prior years presented were not revised. Average customers Kilowatt hours used Average customers Kilowatt hours used 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 355 355 360 360 365 365 370 370 385 385 6.24 6.34 6.44 39 40 42 2011 2012 2013 2014 2015 AVERAGE ANNUAL RESIDENTIAL CONSUMPTION* (in thousands of kilowatt hours) Seattle National AVERAGE RESIDENTIAL RATES* Seattle National AVERAGE ANNUAL NON–RESIDENTIAL CONSUMPTION* Seattle National AVERAGE NON–RESIDENTIAL RATES* (in cents per kilowatt hour) Seattle National (in cents per kilowatt hour) (in thousands of kilowatt hours) 0 3 6 9 12 2011 2012 2013 2014 2015 0 2 6 8 12 0 50 100 150 200 2011 2012 2013 2014 2015 0 2 4 6 8 10 2011 2012 2013 2014 2015 375 375 380 380 10 4 41