v2.4.0.8

Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | $ 1,939 |  | $ 1,572 |  | $ 3,904 |  | $ 2,813 |
Intersegment revenue | 0 |  | 0 |  | 0 |  | 0 |
Operating revenues | 1,939 |  | 1,572 |  | 3,904 |  | 2,813 |
Commodity Margin | 632 | [1] | 533 | [1] | 1,277 | [2] | 994 | [2]
Add: Mark-to-market commodity activity, net and other | 173 | [3] | 39 | [3] | 136 | [4] | (2) | [4]
Plant operating expense | 274 |  | 257 |  | 539 |  | 484 |
Depreciation and amortization expense | 147 |  | 145 |  | 300 |  | 291 |
Sales, general and other administrative expense | 38 |  | 36 |  | 71 |  | 69 |
Other operating expenses | 21 |  | 20 |  | 43 |  | 38 |
(Income) loss from unconsolidated investments in power plants | (4) |  | (8) |  | (13) |  | (16) |
Income from operations | 329 |  | 122 |  | 473 |  | 126 |
Interest expense, net of interest income | 167 |  | 169 |  | 332 |  | 343 |
Debt extinguishment costs and other (income) expense, net | 6 |  | 71 |  | 17 |  | 76 |
Income (loss) before income taxes | 156 |  | (118) |  | 124 |  | (293) |
Commodity Margin for Six Southeast Power Plants Sold | 42 |  | 32 |  | 81 |  | 57 |
Lease levelization | (27) |  | (11) |  | (56) |  | (27) |
Contract amortization | 3 |  | 3 |  | 7 |  | 7 |
West [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | 487 |  | 479 |  | 978 |  | 862 |
Intersegment revenue | 1 |  | 0 |  | 3 |  | 1 |
Operating revenues | 488 |  | 479 |  | 981 |  | 863 |
Commodity Margin | 228 | [1] | 198 | [1] | 430 | [2] | 400 | [2]
Add: Mark-to-market commodity activity, net and other | 21 | [3] | 19 | [3] | 50 | [4] | (18) | [4]
Plant operating expense | 95 |  | 92 |  | 200 |  | 187 |
Depreciation and amortization expense | 58 |  | 53 |  | 118 |  | 106 |
Sales, general and other administrative expense | 7 |  | 8 |  | 17 |  | 15 |
Other operating expenses | 15 |  | 12 |  | 27 |  | 21 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | 74 |  | 52 |  | 118 |  | 53 |
Texas [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | 960 |  | 571 |  | 1,607 |  | 978 |
Intersegment revenue | 3 |  | (25) |  | 15 |  | (18) |
Operating revenues | 963 |  | 546 |  | 1,622 |  | 960 |
Commodity Margin | 177 | [1] | 133 | [1] | 298 | [2] | 209 | [2]
Add: Mark-to-market commodity activity, net and other | 184 | [3] | 34 | [3] | 138 | [4] | 23 | [4]
Plant operating expense | 83 |  | 93 |  | 173 |  | 158 |
Depreciation and amortization expense | 48 |  | 42 |  | 90 |  | 84 |
Sales, general and other administrative expense | 18 |  | 16 |  | 30 |  | 30 |
Other operating expenses | 1 |  | 1 |  | 3 |  | 2 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | 211 |  | 15 |  | 140 |  | (42) |
North [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | 332 |  | 348 |  | 971 |  | 654 |
Intersegment revenue | 12 |  | 8 |  | 27 |  | 15 |
Operating revenues | 344 |  | 356 |  | 998 |  | 669 |
Commodity Margin | 175 | [1] | 159 | [1] | 442 | [2] | 301 | [2]
Add: Mark-to-market commodity activity, net and other | (23) | [3] | (12) | [3] | (40) | [4] | (5) | [4]
Plant operating expense | 65 |  | 46 |  | 117 |  | 89 |
Depreciation and amortization expense | 32 |  | 32 |  | 65 |  | 65 |
Sales, general and other administrative expense | 6 |  | 6 |  | 12 |  | 12 |
Other operating expenses | 8 |  | 7 |  | 14 |  | 14 |
(Income) loss from unconsolidated investments in power plants | (4) |  | (8) |  | (13) |  | (16) |
Income from operations | 45 |  | 64 |  | 207 |  | 132 |
Southeast [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | 160 |  | 174 |  | 348 |  | 319 |
Intersegment revenue | 57 |  | 71 |  | 138 |  | 104 |
Operating revenues | 217 |  | 245 |  | 486 |  | 423 |
Commodity Margin | 52 | [1] | 43 | [1] | 107 | [2] | 84 | [2]
Add: Mark-to-market commodity activity, net and other | (1) | [3] | 7 | [3] | 5 | [4] | 14 | [4]
Plant operating expense | 38 |  | 34 |  | 65 |  | 65 |
Depreciation and amortization expense | 8 |  | 18 |  | 26 |  | 37 |
Sales, general and other administrative expense | 6 |  | 6 |  | 12 |  | 12 |
Other operating expenses | 1 |  | 1 |  | 2 |  | 2 |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | (2) |  | (9) |  | 7 |  | (18) |
Intersegment Elimination [Member] |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Revenue from External Customer | 0 |  | 0 |  | 0 |  | 0 |
Intersegment revenue | (73) |  | (54) |  | (183) |  | (102) |
Operating revenues | (73) |  | (54) |  | (183) |  | (102) |
Commodity Margin | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2]
Add: Mark-to-market commodity activity, net and other | (8) | [3] | (9) | [3] | (17) | [4] | (16) | [4]
Plant operating expense | (7) |  | (8) |  | (16) |  | (15) |
Depreciation and amortization expense | 1 |  | 0 |  | 1 |  | (1) |
Sales, general and other administrative expense | 1 |  | 0 |  | 0 |  | 0 |
Other operating expenses | (4) |  | (1) |  | (3) |  | (1) |
(Income) loss from unconsolidated investments in power plants | 0 |  | 0 |  | 0 |  | 0 |
Income from operations | $ 1 |  | $ 0 |  | $ 1 |  | $ 1 |
[1] | Our Southeast segment includes Commodity Margin of $42 million and $32 million for the three months ended June 30, 2014 and 2013, respectively, related to the six power plants in our Southeast segment that were sold in July 2014.
[2] | Our Southeast segment includes Commodity Margin of $81 million and $57 million for the six months ended June 30, 2014 and 2013, respectively, related to the six power plants in our Southeast segment that were sold in July 2014.
[3] | Includes $(27) million and $(11) million of lease levelization and $3 million and $3 million of amortization expense for the three months ended June 30, 2014 and 2013, respectively.
[4] | Includes $(56) million and $(27) million of lease levelization and $7 million and $7 million of amortization expense for the six months ended June 30, 2014 and 2013, respectively.

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