v2.4.0.6

Segment and Significant Customer Information (Tables) | 12 Months Ended
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Dec. 31, 2011
Segment and Significant Customer Information [Abstract] |
Schedule of Financial Data for Segments | The tables below show our financial data for our segments for the periods indicated (in millions).
| Year Ended December 31, 2011
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,372 |  |  | $ | 2,306 |  |  | $ | 1,336 |  |  | $ | 786 |  |  | $ | — |  |  | $ | 6,800 |
Intersegment revenues | 12 |  |  | 23 |  |  | 7 |  |  | 135 |  |  | (177 | ) |  | — |
Total operating revenues | $ | 2,384 |  |  | $ | 2,329 |  |  | $ | 1,343 |  |  | $ | 921 |  |  | $ | (177 | ) |  | $ | 6,800 |
Commodity Margin | $ | 1,061 |  |  | $ | 469 |  |  | $ | 704 |  |  | $ | 240 |  |  | $ | — |  |  | $ | 2,474 |
Add: Mark-to-market commodity activity, net and other(1)(2) | 113 |  |  | (102 | ) |  | (13 | ) |  | 1 |  |  | (32 | ) |  | (33 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 380 |  |  | 235 |  |  | 177 |  |  | 141 |  |  | (29 | ) |  | 904 |
Depreciation and amortization expense | 192 |  |  | 135 |  |  | 138 |  |  | 90 |  |  | (5 | ) |  | 550 |
Sales, general and other administrative expense | 43 |  |  | 43 |  |  | 24 |  |  | 22 |  |  | (1 | ) |  | 131 |
Other operating expenses(3) | 41 |  |  | 3 |  |  | 30 |  |  | 5 |  |  | (2 | ) |  | 77 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (21 | ) |  | — |  |  | — |  |  | (21 | )
Income (loss) from operations | 518 |  |  | (49 | ) |  | 343 |  |  | (17 | ) |  | 5 |  |  | 800 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 751 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 145 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 115 |
Loss before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | (211 | )
| Year Ended December 31, 2010
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,525 |  |  | $ | 2,162 |  |  | $ | 978 |  |  | $ | 880 |  |  | $ | — |  |  | $ | 6,545 |
Intersegment revenues | 12 |  |  | 22 |  |  | 6 |  |  | 138 |  |  | (178 | ) |  | — |
Total operating revenues | $ | 2,537 |  |  | $ | 2,184 |  |  | $ | 984 |  |  | $ | 1,018 |  |  | $ | (178 | ) |  | $ | 6,545 |
Commodity Margin | $ | 1,080 |  |  | $ | 504 |  |  | $ | 535 |  |  | $ | 272 |  |  | $ | — |  |  | $ | 2,391 |
Add: Mark-to-market commodity activity, net and other(1) | 69 |  |  | 89 |  |  | 21 |  |  | 22 |  |  | (30 | ) |  | 171 |
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 351 |  |  | 285 |  |  | 138 |  |  | 123 |  |  | (29 | ) |  | 868 |
Depreciation and amortization expense | 207 |  |  | 150 |  |  | 111 |  |  | 109 |  |  | (7 | ) |  | 570 |
Sales, general and other administrative expense | 55 |  |  | 38 |  |  | 45 |  |  | 12 |  |  | 1 |  |  | 151 |
Other operating expenses(3) | 59 |  |  | 2 |  |  | 28 |  |  | 4 |  |  | (2 | ) |  | 91 |
Impairment losses | 97 |  |  | — |  |  | — |  |  | 19 |  |  | — |  |  | 116 |
(Gain) on sale of assets, net | — |  |  | (119 | ) |  | — |  |  | — |  |  | — |  |  | (119 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (16 | ) |  | — |  |  | — |  |  | (16 | )
Income from operations | 380 |  |  | 237 |  |  | 250 |  |  | 27 |  |  | 7 |  |  | 901 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 802 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 223 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 106 |
Loss before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | (230 | )
| Year Ended December 31, 2009
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 3,311 |  |  | $ | 1,816 |  |  | $ | 558 |  |  | $ | 778 |  |  | $ | — |  |  | $ | 6,463 |
Intersegment revenues | 28 |  |  | 63 |  |  | 16 |  |  | 97 |  |  | (204 | ) |  | — |
Total operating revenues | $ | 3,339 |  |  | $ | 1,879 |  |  | $ | 574 |  |  | $ | 875 |  |  | $ | (204 | ) |  | $ | 6,463 |
Commodity Margin | $ | 1,245 |  |  | $ | 644 |  |  | $ | 268 |  |  | $ | 304 |  |  | $ | — |  |  | $ | 2,461 |
Add: Mark-to-market commodity activity, net and other(1) | 143 |  |  | (40 | ) |  | 46 |  |  | (5 | ) |  | (44 | ) |  | 100 |
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 408 |  |  | 232 |  |  | 91 |  |  | 134 |  |  | 3 |  |  | 868 |
Depreciation and amortization expense | 188 |  |  | 129 |  |  | 67 |  |  | 80 |  |  | (8 | ) |  | 456 |
Sales, general and other administrative expense | 66 |  |  | 63 |  |  | 18 |  |  | 27 |  |  | — |  |  | 174 |
Other operating expenses(3) | 73 |  |  | 14 |  |  | 30 |  |  | 11 |  |  | (32 | ) |  | 96 |
Impairment losses | 4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |
(Income) from unconsolidated investments in power plants | (32 | ) |  | — |  |  | (18 | ) |  | — |  |  | — |  |  | (50 | )
Income from operations | 681 |  |  | 166 |  |  | 126 |  |  | 47 |  |  | (7 | ) |  | 1,013 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 799 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 89 |
Income before income taxes and discontinued operations |  |  |  |  |  |  |  |  |  |  | $ | 125 |
__________
(1) | Mark-to-market commodity activity represents the unrealized portion of our mark-to-market activity, net, included in operating revenues and fuel and purchased energy expense on our Consolidated Statements of Operations for the years ended December 31, 2011, 2010 and 2009, as well as a non-cash gain from amortization of prepaid power sales agreements for the year ended December 31, 2009.
(2) | Includes $12 million of lease levelization and $8 million of contract amortization for the year ended December 31, 2011 related to contracts that became effective in 2011.
(3) | Excludes $10 million, $9 million and $5 million of RGGI compliance and other environmental costs for the years ended December 31, 2011, 2010 and 2009, respectively, which are components of Commodity Margin.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 + Details
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