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Segment and Significant Customer Information | 9 Months Ended
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Sep. 30, 2012
Segment and Significant Customer Information [Abstract] |
Segment and Significant Customer Information | Segment Information We assess our business on a regional basis due to the impact on our financial performance of the differing characteristics of these regions, particularly with respect to competition, regulation and other factors impacting supply and demand. At September 30, 2012, our reportable segments were West (including geothermal), Texas, North (including Canada) and Southeast. We continue to evaluate the optimal manner in which we assess our performance including our segments and future changes may result. Commodity Margin is a key operational measure reviewed by our chief operating decision maker to assess the performance of our segments. The tables below show our financial data for our segments for the periods indicated (in millions).
| Three Months Ended September 30, 2012
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 509 |  |  | $ | 886 |  |  | $ | 407 |  |  | $ | 194 |  |  | $ | — |  |  | $ | 1,996 |
Intersegment revenues | 2 |  |  | (34 | ) |  | 4 |  |  | 68 |  |  | (40 | ) |  | — |
Total operating revenues | $ | 511 |  |  | $ | 852 |  |  | $ | 411 |  |  | $ | 262 |  |  | $ | (40 | ) |  | $ | 1,996 |
Commodity Margin(1) | $ | 330 |  |  | $ | 218 |  |  | $ | 266 |  |  | $ | 83 |  |  | $ | — |  |  | $ | 897 |
Add: Mark-to-market commodity activity, net and other(2)(3) | (40 | ) |  | 249 |  |  | (26 | ) |  | 27 |  |  | (8 | ) |  | 202 |
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 88 |  |  | 49 |  |  | 51 |  |  | 29 |  |  | (10 | ) |  | 207 |
Depreciation and amortization expense | 52 |  |  | 35 |  |  | 33 |  |  | 21 |  |  | (1 | ) |  | 140 |
Sales, general and other administrative expense | 9 |  |  | 12 |  |  | 8 |  |  | 8 |  |  | (1 | ) |  | 36 |
Other operating expenses(4) | 10 |  |  | 1 |  |  | 6 |  |  | (1 | ) |  | 2 |  |  | 18 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (7 | ) |  | — |  |  | — |  |  | (7 | )
Income from operations | 131 |  |  | 370 |  |  | 149 |  |  | 53 |  |  | 2 |  |  | 705 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 181 |
Other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 6 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 518 |
| Three Months Ended September 30, 2011
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 688 |  |  | $ | 843 |  |  | $ | 430 |  |  | $ | 248 |  |  | $ | — |  |  | $ | 2,209 |
Intersegment revenues | 3 |  |  | 3 |  |  | (8 | ) |  | 31 |  |  | (29 | ) |  | — |
Total operating revenues | $ | 691 |  |  | $ | 846 |  |  | $ | 422 |  |  | $ | 279 |  |  | $ | (29 | ) |  | $ | 2,209 |
Commodity Margin(1) | $ | 329 |  |  | $ | 162 |  |  | $ | 259 |  |  | $ | 75 |  |  | $ | — |  |  | $ | 825 |
Add: Mark-to-market commodity activity, net and other(2)(3) | 20 |  |  | (21 | ) |  | (11 | ) |  | — |  |  | (8 | ) |  | (20 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 94 |  |  | 50 |  |  | 44 |  |  | 33 |  |  | (9 | ) |  | 212 |
Depreciation and amortization expense | 52 |  |  | 34 |  |  | 36 |  |  | 22 |  |  | (1 | ) |  | 143 |
Sales, general and other administrative expense | 10 |  |  | 10 |  |  | 7 |  |  | 7 |  |  | (1 | ) |  | 33 |
Other operating expenses(4) | 11 |  |  | (1 | ) |  | 7 |  |  | — |  |  | 2 |  |  | 19 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (5 | ) |  | — |  |  | — |  |  | (5 | )
Income from operations | 182 |  |  | 48 |  |  | 159 |  |  | 13 |  |  | 1 |  |  | 403 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 190 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 3 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | — |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 210 |
| Nine Months Ended September 30, 2012
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,183 |  |  | $ | 1,430 |  |  | $ | 974 |  |  | $ | 524 |  |  | $ | — |  |  | $ | 4,111 |
Intersegment revenues | 7 |  |  | 27 |  |  | 9 |  |  | 84 |  |  | (127 | ) |  | — |
Total operating revenues | $ | 1,190 |  |  | $ | 1,457 |  |  | $ | 983 |  |  | $ | 608 |  |  | $ | (127 | ) |  | $ | 4,111 |
Commodity Margin(1) | $ | 748 |  |  | $ | 472 |  |  | $ | 591 |  |  | $ | 212 |  |  | $ | — |  |  | $ | 2,023 |
Add: Mark-to-market commodity activity, net and other(2)(5) | (80 | ) |  | 66 |  |  | (17 | ) |  | (5 | ) |  | (22 | ) |  | (58 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 281 |  |  | 189 |  |  | 154 |  |  | 98 |  |  | (23 | ) |  | 699 |
Depreciation and amortization expense | 151 |  |  | 104 |  |  | 100 |  |  | 66 |  |  | (3 | ) |  | 418 |
Sales, general and other administrative expense | 23 |  |  | 36 |  |  | 22 |  |  | 23 |  |  | — |  |  | 104 |
Other operating expenses(4) | 30 |  |  | 4 |  |  | 21 |  |  | 2 |  |  | 1 |  |  | 58 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (21 | ) |  | — |  |  | — |  |  | (21 | )
Income from operations | 183 |  |  | 205 |  |  | 298 |  |  | 18 |  |  | 3 |  |  | 707 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 545 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 14 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 26 |
Income before income taxes |  |  |  |  |  |  |  |  |  |  | $ | 122 |
| Nine Months Ended September 30, 2011
| West |  | Texas |  | North |  | Southeast |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,753 |  |  | $ | 1,939 |  |  | $ | 1,025 |  |  | $ | 624 |  |  | $ | — |  |  | $ | 5,341 |
Intersegment revenues | 7 |  |  | 13 |  |  | 5 |  |  | 116 |  |  | (141 | ) |  | — |
Total operating revenues | $ | 1,760 |  |  | $ | 1,952 |  |  | $ | 1,030 |  |  | $ | 740 |  |  | $ | (141 | ) |  | $ | 5,341 |
Commodity Margin(1) | $ | 798 |  |  | $ | 357 |  |  | $ | 578 |  |  | $ | 188 |  |  | $ | — |  |  | $ | 1,921 |
Add: Mark-to-market commodity activity, net and other(2)(5) | 36 |  |  | (54 | ) |  | (12 | ) |  | (4 | ) |  | (23 | ) |  | (57 | )
Less: |  |  |  |  |  |  |  |  |  |  |
Plant operating expense | 297 |  |  | 193 |  |  | 136 |  |  | 107 |  |  | (22 | ) |  | 711 |
Depreciation and amortization expense | 140 |  |  | 99 |  |  | 102 |  |  | 67 |  |  | (3 | ) |  | 405 |
Sales, general and other administrative expense | 29 |  |  | 33 |  |  | 19 |  |  | 18 |  |  | — |  |  | 99 |
Other operating expenses(4) | 30 |  |  | 2 |  |  | 23 |  |  | 3 |  |  | (1 | ) |  | 57 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (12 | ) |  | — |  |  | — |  |  | (12 | )
Income (loss) from operations | 338 |  |  | (24 | ) |  | 298 |  |  | (11 | ) |  | 3 |  |  | 604 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  |  |  | 568 |
Loss on interest rate derivatives |  |  |  |  |  |  |  |  |  |  | 149 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  |  |  | 108 |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  | $ | (221 | )
_________
(1) | Our North segment includes Commodity Margin related to Riverside Energy Center, LLC of $32 million and $31 million for the three months ended September 30, 2012 and 2011, respectively, and $64 million and $62 million for the nine months ended September 30, 2012 and 2011, respectively.
(2) | Mark-to-market commodity activity represents the change in the unrealized portion of our mark-to-market activity, net, included in operating revenues and fuel and purchased energy expense on our Consolidated Condensed Statements of Operations.
(3) | Includes $16 million and $11 million of lease levelization for the three months ended September 30, 2012 and 2011, respectively, and $4 million of amortization expense for each of the three months ended September 30, 2012 and 2011.
(4) | Excludes $4 million and $3 million of RGGI compliance and other environmental costs for the three months ended September 30, 2012 and 2011, respectively, and $9 million and $7 million for the nine months ended September 30, 2012 and 2011, respectively, which are components of Commodity Margin.
(5) | Includes $7 million and $15 million of lease levelization and $11 million and $5 million of amortization expense for the nine months ended September 30, 2012 and 2011, respectively.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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