Seattle City Light 2016 ANNUAL REPORT | Audited Financial Statements 82 THE CITY OF SEATTLE—CITY LIGHT DEPARTMENT OTHER INFORMATION (UNAUDITED) - 82 - POWER COSTS AND STATISTICS Year ending December 31 2016 2015 2014 2013 2012 ($ in millions) POWER COSTS Hydroelectric generation (a)(c) 53.0 $ 50.1 $ 49.9 $ 54.0 $ 45.7 $ Long-term purchased power (b) 219.8 213.6 214.3 203.1 204.1 Wholesale power purchases (c)(e) 15.1 26.8 14.9 19.8 11.8 Fair valuation & other power purchases (b)(e) 10.5 11.8 17.7 14.1 7.8 Owned transmission (a) 15.9 17.2 15.3 15.1 14.5 Wheeling expenses 42.9 42.0 42.1 37.4 36.5 Other power expenses 12.8 12.9 13.2 12.2 10.3 Total power costs 370.0 374.4 367.4 355.7 330.7 Less short-term wholesale power sales (c) (62.9) (61.2) (96.8) (63.0) (70.4) Less other power-related revenues (16.7) (19.9) (25.5) (21.5) (16.8) Less fair valuation other power-related (b) (15.9) (16.9) (25.3) (18.9) (12.5) Net power costs 274.5 $ 276.4 $ 219.8 $ 252.3 $ 231.0 $ POWER STATISTICS (MWh) Hydroelectric generation (c) 6,707,264 5,979,884 7,091,368 6,108,908 6,947,088 Long-term purchased power (b) 7,215,308 6,900,647 6,658,689 6,482,960 7,232,362 Wholesale power purchases (c)(e) 936,289 1,379,168 900,527 2,072,066 2,592,354 Wholesale power sales (c)(e) (4,044,452) (3,548,507) (4,083,391) (3,854,352) (5,625,088) Other (d) (1,117,826) (1,023,970) (655,569) (760,882) (1,064,692) Total power available 9,696,583 9,687,222 9,911,624 10,048,700 10,082,024 Less self consumed energy (24,912) (25,195) (29,717) (30,910) (31,072) Less system losses (491,233) (504,533) (541,323) (511,390) (584,310) Total power delivered to retail customers 9,180,438 9,157,494 9,340,584 9,506,400 9,466,642 Net power cost per MWh delivered 29.90 $ 30.18 $ 23.53 $ 26.53 $ 24.40 $ (a) Including depreciation. (b) Long-term purchased power, fair valuation & other power purchases, and fair valuation other power-related include energy exchanged under seasonal and other exchange contracts are valued at market. Disclosures required by GASB Statement No. 72, Fair Value Measurement and Application , are available in Note 2 Fair Value Measurements. (c) The level of generation (and consequently the amount of power purchased and sold on the wholesale market) can fluctuate widely from year to year depending upon water conditions in the Northwest region. (d) "Other" includes seasonal exchange power delivered and miscellaneous power transactions. (e) Bookout purchases are excluded from wholesale power purchases and are reported on a net basis in wholesale power sales, however MWh are presented gross.