Note 8  Segment Reporting The Companys segment structure reflects how management currently operates and allocates resources. The Company's businesses are segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss). Three months ended September 30, 2019 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating Revenues $ 90 $ 151 $ 55 $ - $ 296 Cost of operations 14 36 36 - 86 Depreciation and amortization 25 80 7 - 112 General and administrative - 1 1 5 7 Development costs - - 1 - 1 Operating Income (Loss) 51 34 10 (5 ) 90 Equity in earnings of unconsolidated affiliates 3 35 - - 38 Other income, net - 2 - - 2 Interest expense (13 ) (65 ) (5 ) (22 ) (105 ) Net Income (Loss) 41 6 5 (27 ) 25 Total Assets $ 1,766 $ 6,330 $ 632 $ 34 $ 8,762 Three months ended September 30, 2018 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating Revenues $ 87 $ 152 $ 53 $ - $ 292 Cost of operations 12 39 33 - 84 Depreciation and amortization 26 52 6 - 84 General and administrative - - - 6 6 Acquisition-related transaction and integration costs - - - 17 17 Development costs - - - 1 1 Operating Income (Loss) 49 61 14 (24 ) 100 Equity in earnings of unconsolidated affiliates 3 29 - - 32 Other income, net - 1 - 1 2 Interest expense (13 ) (36 ) (4 ) (17 ) (70 ) Net Income (Loss) $ 39 $ 55 $ 10 $ (40 ) $ 64 Nine months ended September 30, 2019 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating Revenues $ 253 $ 392 $ 152 $ - $ 797 Cost of operations 44 106 99 - 249 Depreciation and amortization 75 190 20 - 285 Impairment losses - - 19 - 19 General and administrative - 1 2 16 19 Acquisition-related transaction and integration costs - - - 2 2 Development costs - - 4 - 4 Operating Income (Loss) 134 95 8 (18 ) 219 Equity in earnings of unconsolidated affiliates 7 45 - - 52 Other income, net 1 4 - 1 6 Loss on debt extinguishment - (1 ) - - (1 ) Interest expense (45 ) (213 ) (13 ) (65 ) (336 ) Income (Loss) $ 97 $ (70 ) $ (5 ) $ (82 ) $ (60 ) Nine months ended September 30, 2018 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating Revenues $ 251 $ 427 $ 146 $ - $ 824 Cost of operations 44 106 97 - 247 Depreciation and amortization 76 154 17 - 247 General and administrative - - - 17 17 Acquisition-related transaction and integration costs - - - 19 19 Development costs - - - 1 1 Operating Income (Loss) 131 167 32 (37 ) 293 Equity in earnings of unconsolidated affiliates 8 57 - - 65 Other income, net 1 2 - 1 4 Interest expense (33 ) (95 ) (8 ) (54 ) (190 ) Net Income (Loss) $ 107 $ 131 $ 24 $ (90 ) $ 172