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Segment Information | 9 Months Ended
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Sep. 30, 2014
Segment Reporting [Abstract] |
Segment 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. During the third quarter of 2014, we altered the composition of our geographic segments to combine our former North and Southeast segments into one segment which was renamed the East segment. This change reflects the manner in which our geographic information is presented internally to our chief operating decision maker following the sale of six power plants in July 2014 from what was formerly our Southeast segment. Thus, beginning in the third quarter of 2014, our reportable segments are West (including geothermal), Texas and East (including North, Southeast and Canada). Our segment data below has been revised to present our segments on this revised basis for all periods. Commodity Margin is a key operational measure reviewed by our chief operating decision maker to assess the performance of our segments. During the fourth quarter of 2013, we changed the methodology previously used during 2013 for allocating corporate expenses to our segments. This change had no impact on our Consolidated Condensed Statements of Operations for the three and nine months ended September 30, 2014; however, segment amounts previously reported for the three and nine months ended September 30, 2013 were adjusted by immaterial amounts. Our segment data for the three and nine months ended September 30, 2013 have been recast to reflect these changes. The tables below show our financial data for our segments for the periods indicated (in millions).
| Three Months Ended September 30, 2014
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 714 |  |  | $ | 985 |  |  | $ | 488 |  |  | $ | — |  |  | $ | 2,187 |
Intersegment revenues | 1 |  |  | 4 |  |  | 2 |  |  | (7 | ) |  | — |
Total operating revenues | $ | 715 |  |  | $ | 989 |  |  | $ | 490 |  |  | $ | (7 | ) |  | $ | 2,187 |
Commodity Margin(1) | $ | 361 |  |  | $ | 346 |  |  | $ | 237 |  |  | $ | — |  |  | $ | 944 |
Add: Mark-to-market commodity activity, net and other(2) | 41 |  |  | (64 | ) |  | 4 |  |  | (6 | ) |  | (25 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 91 |  |  | 77 |  |  | 55 |  |  | (8 | ) |  | 215 |
Depreciation and amortization expense | 65 |  |  | 51 |  |  | 38 |  |  | (1 | ) |  | 153 |
Sales, general and other administrative expense | 11 |  |  | 18 |  |  | 8 |  |  | — |  |  | 37 |
Other operating expenses | 12 |  |  | 1 |  |  | 6 |  |  | 4 |  |  | 23 |
Impairment losses | — |  |  | — |  |  | 123 |  |  | — |  |  | 123 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (753 | ) |  | — |  |  | (753 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (5 | ) |  | — |  |  | (5 | )
Income from operations | 223 |  |  | 135 |  |  | 769 |  |  | (1 | ) |  | 1,126 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 154 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 344 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 628 |
| Three Months Ended September 30, 2013
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 620 |  |  | $ | 842 |  |  | $ | 588 |  |  | $ | — |  |  | $ | 2,050 |
Intersegment revenues | 1 |  |  | (6 | ) |  | 43 |  |  | (38 | ) |  | — |
Total operating revenues | $ | 621 |  |  | $ | 836 |  |  | $ | 631 |  |  | $ | (38 | ) |  | $ | 2,050 |
Commodity Margin(1) | $ | 337 |  |  | $ | 328 |  |  | $ | 320 |  |  | $ | — |  |  | $ | 985 |
Add: Mark-to-market commodity activity, net and other(2) | 16 |  |  | (5 | ) |  | 3 |  |  | (8 | ) |  | 6 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 84 |  |  | 56 |  |  | 67 |  |  | (7 | ) |  | 200 |
Depreciation and amortization expense | 58 |  |  | 41 |  |  | 51 |  |  | — |  |  | 150 |
Sales, general and other administrative expense | 9 |  |  | 13 |  |  | 10 |  |  | 1 |  |  | 33 |
Other operating expenses | 12 |  |  | 2 |  |  | 9 |  |  | (3 | ) |  | 20 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (9 | ) |  | — |  |  | (9 | )
Income from operations | 190 |  |  | 211 |  |  | 195 |  |  | 1 |  |  | 597 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 174 |
Other (income) expense, net |  |  |  |  |  |  |  |  | 7 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 416 |
| Nine Months Ended September 30, 2014
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,692 |  |  | $ | 2,592 |  |  | $ | 1,807 |  |  | $ | — |  |  | $ | 6,091 |
Intersegment revenues | 4 |  |  | 19 |  |  | 46 |  |  | (69 | ) |  | — |
Total operating revenues | $ | 1,696 |  |  | $ | 2,611 |  |  | $ | 1,853 |  |  | $ | (69 | ) |  | $ | 6,091 |
Commodity Margin(3) | $ | 791 |  |  | $ | 644 |  |  | $ | 786 |  |  | $ | — |  |  | $ | 2,221 |
Add: Mark-to-market commodity activity, net and other(4) | 91 |  |  | 74 |  |  | (31 | ) |  | (23 | ) |  | 111 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 291 |  |  | 250 |  |  | 237 |  |  | (24 | ) |  | 754 |
Depreciation and amortization expense | 183 |  |  | 141 |  |  | 129 |  |  | — |  |  | 453 |
Sales, general and other administrative expense | 28 |  |  | 48 |  |  | 32 |  |  | — |  |  | 108 |
Other operating expenses | 39 |  |  | 4 |  |  | 22 |  |  | 1 |  |  | 66 |
Impairment losses | — |  |  | — |  |  | 123 |  |  | — |  |  | 123 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (753 | ) |  | — |  |  | (753 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (18 | ) |  | — |  |  | (18 | )
Income from operations | 341 |  |  | 275 |  |  | 983 |  |  | — |  |  | 1,599 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 486 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 361 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 752 |
| Nine Months Ended September 30, 2013
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,482 |  |  | $ | 1,820 |  |  | $ | 1,561 |  |  | $ | — |  |  | $ | 4,863 |
Intersegment revenues | 2 |  |  | (24 | ) |  | 101 |  |  | (79 | ) |  | — |
Total operating revenues | $ | 1,484 |  |  | $ | 1,796 |  |  | $ | 1,662 |  |  | $ | (79 | ) |  | $ | 4,863 |
Commodity Margin(3) | $ | 737 |  |  | $ | 537 |  |  | $ | 705 |  |  | $ | — |  |  | $ | 1,979 |
Add: Mark-to-market commodity activity, net and other(4) | (2 | ) |  | 18 |  |  | 12 |  |  | (24 | ) |  | 4 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 271 |  |  | 214 |  |  | 221 |  |  | (22 | ) |  | 684 |
Depreciation and amortization expense | 164 |  |  | 125 |  |  | 153 |  |  | (1 | ) |  | 441 |
Sales, general and other administrative expense | 24 |  |  | 43 |  |  | 34 |  |  | 1 |  |  | 102 |
Other operating expenses | 33 |  |  | 4 |  |  | 25 |  |  | (4 | ) |  | 58 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (25 | ) |  | — |  |  | (25 | )
Income from operations | 243 |  |  | 169 |  |  | 309 |  |  | 2 |  |  | 723 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 517 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 83 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 123 |
_________
(1) | Commodity Margin related to the six power plants sold in our East segment on July 3, 2014, was not significant for the three months ended September 30, 2014. Commodity Margin related to these plants was $65 million for the three months ended September 30, 2013.
(2) | Includes $49 million and $44 million of lease levelization and $4 million and $4 million of amortization expense for the three months ended September 30, 2014 and 2013, respectively.
(3) | Our East segment includes Commodity Margin of $81 million and $122 million for the nine months ended September 30, 2014 and 2013, respectively, related to the six power plants in our East segment that were sold in July 2014.
(4) | Includes $(7) million and $17 million of lease levelization and $11 million and $11 million of amortization expense for the nine months ended September 30, 2014 and 2013, 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 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: 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 4: 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 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 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: 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 8: 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 Reference 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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 + Details
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