| Schedule of Financial Data for Segments |
The tables below show our financial data for our segments for the periods indicated (in millions). | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2016 | | West | | Texas | | East | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 211 |
| | $ | 530 |
| | $ | 423 |
| | $ | — |
| | $ | 1,164 |
| Intersegment revenues | 1 |
| | 4 |
| | 4 |
| | (9 | ) | | — |
| Total operating revenues | $ | 212 |
| | $ | 534 |
| | $ | 427 |
| | $ | (9 | ) | | $ | 1,164 |
| Commodity Margin | $ | 254 |
| | $ | 160 |
| | $ | 243 |
| | $ | — |
| | $ | 657 |
| Add: Mark-to-market commodity activity, net and other(1) | (62 | ) | | 7 |
| | 28 |
| | (8 | ) | | (35 | ) | Less: | | | | | | | | | | Plant operating expense | 98 |
| | 85 |
| | 96 |
| | (8 | ) | | 271 |
| Depreciation and amortization expense | 56 |
| | 53 |
| | 53 |
| | — |
| | 162 |
| Sales, general and other administrative expense | 8 |
| | 14 |
| | 12 |
| | 1 |
| | 35 |
| Other operating expenses | 7 |
| | 2 |
| | 10 |
| | (2 | ) | | 17 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (3 | ) | | — |
| | (3 | ) | Income from operations | 23 |
| | 13 |
| | 103 |
| | 1 |
| | 140 |
| Interest expense, net of interest income | | | | | | | | | 156 |
| Debt extinguishment costs and other (income) expense, net | | | | | | | | | 22 |
| Loss before income taxes | | | | | | | | | $ | (38 | ) |
| | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2015 | | West | | Texas | | East | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 421 |
| | $ | 570 |
| | $ | 451 |
| | $ | — |
| | $ | 1,442 |
| Intersegment revenues | — |
| | 5 |
| | 2 |
| | (7 | ) | | — |
| Total operating revenues | $ | 421 |
| | $ | 575 |
| | $ | 453 |
| | $ | (7 | ) | | $ | 1,442 |
| Commodity Margin | $ | 240 |
| | $ | 170 |
| | $ | 247 |
| | $ | — |
| | $ | 657 |
| Add: Mark-to-market commodity activity, net and other(1) | (14 | ) | | 10 |
| | 30 |
| | (7 | ) | | 19 |
| Less: | | | | | | | | | | Plant operating expense | 120 |
| | 82 |
| | 77 |
| | (7 | ) | | 272 |
| Depreciation and amortization expense | 65 |
| | 50 |
| | 45 |
| | — |
| | 160 |
| Sales, general and other administrative expense | 6 |
| | 15 |
| | 9 |
| | — |
| | 30 |
| Other operating expenses | 10 |
| | 2 |
| | 8 |
| | — |
| | 20 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (7 | ) | | — |
| | (7 | ) | Income from operations | 25 |
| | 31 |
| | 145 |
| | — |
| | 201 |
| Interest expense, net of interest income | | | | | | | | | 157 |
| Debt modification costs and other (income) expense, net | | | | | | | | | 18 |
| Income before income taxes | | | | | | | | | $ | 26 |
|
| | | | | | | | | | | | | | | | | | | | | | Six Months Ended June 30, 2016 | | West | | Texas | | East | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 635 |
| | $ | 1,062 |
| | $ | 1,082 |
| | $ | — |
| | $ | 2,779 |
| Intersegment revenues | 3 |
| | 7 |
| | 7 |
| | (17 | ) | | — |
| Total operating revenues | $ | 638 |
| | $ | 1,069 |
| | $ | 1,089 |
| | $ | (17 | ) | | $ | 2,779 |
| Commodity Margin | $ | 451 |
| | $ | 313 |
| | $ | 473 |
| | $ | — |
| | $ | 1,237 |
| Add: Mark-to-market commodity activity, net and other(2) | (16 | ) | | (103 | ) | | 7 |
| | (14 | ) | | (126 | ) | Less: | | | | | | | | | | Plant operating expense | 189 |
| | 171 |
| | 180 |
| | (14 | ) | | 526 |
| Depreciation and amortization expense | 125 |
| | 106 |
| | 111 |
| | — |
| | 342 |
| Sales, general and other administrative expense | 18 |
| | 30 |
| | 24 |
| | 1 |
| | 73 |
| Other operating expenses | 15 |
| | 4 |
| | 20 |
| | (2 | ) | | 37 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (10 | ) | | — |
| | (10 | ) | Income (loss) from operations | 88 |
| | (101 | ) | | 155 |
| | 1 |
| | 143 |
| Interest expense, net of interest income | | | | | | | | | 312 |
| Debt extinguishment costs and other (income) expense, net | | | | | | | | | 28 |
| Loss before income taxes | | | | | | | | | $ | (197 | ) |
| | | | | | | | | | | | | | | | | | | | | | Six Months Ended June 30, 2015 | | West | | Texas | | East | | Consolidation and Elimination | | Total | Revenues from external customers | $ | 936 |
| | $ | 1,151 |
| | $ | 1,001 |
| | $ | — |
| | $ | 3,088 |
| Intersegment revenues | 2 |
| | 8 |
| | 4 |
| | (14 | ) | | — |
| Total operating revenues | $ | 938 |
| | $ | 1,159 |
| | $ | 1,005 |
| | $ | (14 | ) | | $ | 3,088 |
| Commodity Margin | $ | 458 |
| | $ | 319 |
| | $ | 415 |
| | $ | — |
| | $ | 1,192 |
| Add: Mark-to-market commodity activity, net and other(2) | 105 |
| | 51 |
| | (22 | ) | | (14 | ) | | 120 |
| Less: | | | | | | | | | | Plant operating expense | 226 |
| | 171 |
| | 149 |
| | (14 | ) | | 532 |
| Depreciation and amortization expense | 132 |
| | 99 |
| | 87 |
| | — |
| | 318 |
| Sales, general and other administrative expense | 16 |
| | 32 |
| | 19 |
| | — |
| | 67 |
| Other operating expenses | 20 |
| | 4 |
| | 16 |
| | — |
| | 40 |
| (Income) from unconsolidated investments in power plants | — |
| | — |
| | (12 | ) | | — |
| | (12 | ) | Income from operations | 169 |
|
| 64 |
|
| 134 |
|
| — |
| | 367 |
| Interest expense, net of interest income | | | | | | | | | 310 |
| Debt modification and extinguishment costs and other (income) expense, net | | | | | | | | | 39 |
| Income before income taxes | | | | | | | | | $ | 18 |
|
_________ | | (1) | Includes $(20) million and $(18) million of lease levelization and $27 million and $3 million of amortization expense for the three months ended June 30, 2016 and 2015, respectively. |
| | (2) | Includes $(42) million and $(42) million of lease levelization and $54 million and $7 million of amortization expense for the six months ended June 30, 2016 and 2015, respectively. |
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