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Segment and Significant Customer Information | 12 Months Ended
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Dec. 31, 2015
Segment and Significant Customer Information [Abstract] |
Segment and Significant Customer Information |
| Segment and Significant Customer 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 December 31, 2015, our reportable segments were West (including geothermal), Texas and East (including Canada). We continue to evaluate the optimal manner in which we assess our performance including our segments and future changes may result in changes to the composition of our geographic segments. 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).
| Year Ended December 31, 2015
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,089 |  |  | $ | 2,344 |  |  | $ | 2,039 |  |  | $ | — |  |  | $ | 6,472 |
Intersegment revenues | 5 |  |  | 15 |  |  | 8 |  |  | (28 | ) |  | — |
Total operating revenues | $ | 2,094 |  |  | $ | 2,359 |  |  | $ | 2,047 |  |  | $ | (28 | ) |  | $ | 6,472 |
Commodity Margin | $ | 1,106 |  |  | $ | 736 |  |  | $ | 944 |  |  | $ | — |  |  | $ | 2,786 |
Add: Mark-to-market commodity activity, net and other(1) | 160 |  |  | (120 | ) |  | (92 | ) |  | (29 | ) |  | (81 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 416 |  |  | 338 |  |  | 292 |  |  | (28 | ) |  | 1,018 |
Depreciation and amortization expense | 250 |  |  | 204 |  |  | 184 |  |  | — |  |  | 638 |
Sales, general and other administrative expense | 35 |  |  | 63 |  |  | 40 |  |  | — |  |  | 138 |
Other operating expenses | 37 |  |  | 9 |  |  | 36 |  |  | (2 | ) |  | 80 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (24 | ) |  | — |  |  | (24 | )
Income from operations | 528 |  |  | 2 |  |  | 324 |  |  | 1 |  |  | 855 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 624 |
Debt modification and extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 58 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 173 |
| Year Ended December 31, 2014
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 2,352 |  |  | $ | 3,229 |  |  | $ | 2,449 |  |  | $ | — |  |  | $ | 8,030 |
Intersegment revenues | 6 |  |  | 23 |  |  | 47 |  |  | (76 | ) |  | — |
Total operating revenues | $ | 2,358 |  |  | $ | 3,252 |  |  | $ | 2,496 |  |  | $ | (76 | ) |  | $ | 8,030 |
Commodity Margin(2) | $ | 1,050 |  |  | $ | 760 |  |  | $ | 949 |  |  | $ | — |  |  | $ | 2,759 |
Add: Mark-to-market commodity activity, net and other(1) | 220 |  |  | 142 |  |  | 48 |  |  | (31 | ) |  | 379 |
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 385 |  |  | 313 |  |  | 302 |  |  | (31 | ) |  | 969 |
Depreciation and amortization expense | 245 |  |  | 191 |  |  | 168 |  |  | (1 | ) |  | 603 |
Sales, general and other administrative expense | 41 |  |  | 64 |  |  | 39 |  |  | — |  |  | 144 |
Other operating expenses | 50 |  |  | 5 |  |  | 32 |  |  | 1 |  |  | 88 |
Impairment losses | — |  |  | — |  |  | 123 |  |  | — |  |  | 123 |
(Gain) on sale of assets, net | — |  |  | — |  |  | (753 | ) |  | — |  |  | (753 | )
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (25 | ) |  | — |  |  | (25 | )
Income from operations | 549 |  |  | 329 |  |  | 1,111 |  |  | — |  |  | 1,989 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 639 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 367 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 983 |
| Year Ended December 31, 2013
| West |  | Texas |  | East |  | Consolidation and Elimination |  | Total
Revenues from external customers | $ | 1,937 |  |  | $ | 2,347 |  |  | $ | 2,017 |  |  | $ | — |  |  | $ | 6,301 |
Intersegment revenues | 5 |  |  | (4 | ) |  | 117 |  |  | (118 | ) |  | — |
Total operating revenues | $ | 1,942 |  |  | $ | 2,343 |  |  | $ | 2,134 |  |  | $ | (118 | ) |  | $ | 6,301 |
Commodity Margin(2) | $ | 1,020 |  |  | $ | 632 |  |  | $ | 916 |  |  | $ | — |  |  | $ | 2,568 |
Add: Mark-to-market commodity activity, net and other(1) | (50 | ) |  | 51 |  |  | 27 |  |  | (31 | ) |  | (3 | )
Less: |  |  |  |  |  |  |  |  |
Plant operating expense | 365 |  |  | 269 |  |  | 292 |  |  | (31 | ) |  | 895 |
Depreciation and amortization expense | 227 |  |  | 165 |  |  | 203 |  |  | (2 | ) |  | 593 |
Sales, general and other administrative expense | 37 |  |  | 56 |  |  | 42 |  |  | 1 |  |  | 136 |
Other operating expenses | 45 |  |  | 3 |  |  | 33 |  |  | — |  |  | 81 |
Impairment losses | 16 |  |  | — |  |  | — |  |  | — |  |  | 16 |
(Income) from unconsolidated investments in power plants | — |  |  | — |  |  | (30 | ) |  | — |  |  | (30 | )
Income from operations | 280 |  |  | 190 |  |  | 403 |  |  | 1 |  |  | 874 |
Interest expense, net of interest income |  |  |  |  |  |  |  |  | 690 |
Debt extinguishment costs and other (income) expense, net |  |  |  |  |  |  |  |  | 164 |
Income before income taxes |  |  |  |  |  |  |  |  | $ | 20 |
__________
(1) | Includes $(2) million, $(5) million and $6 million of lease levelization and $20 million, $14 million and $14 million of amortization expense for the years ended December 31, 2015, 2014 and 2013, respectively.
(2) | Our East segment includes Commodity Margin of $81 million and $152 million for the years ended December 31, 2014 and 2013, respectively, related to the six power plants in our East segment that were sold in July 2014.
Significant Customers For the years ended December 31, 2015 and 2013, we had two significant customers, PJM Settlement, Inc. and PG&E, that individually accounted for more than 10% of our annual consolidated revenues. For the year ended December 31, 2014, we had only one significant customer, PJM Settlement, Inc. that individually accounted for more than 10% of our annual consolidated revenues. Our revenues from PJM Settlement, Inc. for the years ended December 31, 2015, 2014 and 2013 were approximately $724 million, $1.0 billion and $820 million respectively, and were attributed to our East segment. Our revenues from PG&E were approximately $642 million and $694 million for the years ended December 31, 2015 and 2013 respectively, which were attributed to our West segment.

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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 34 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599 Reference 2: 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=51669610&loc=d3e9038-108599 Reference 3: 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=51669610&loc=d3e8971-108599 Reference 4: 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=51669610&loc=d3e8595-108599 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=51669610&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 32 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599 Reference 7: 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=51669610&loc=d3e8844-108599 Reference 8: 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=51669610&loc=d3e8984-108599 Reference 9: 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=51669610&loc=d3e9031-108599 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=51669610&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 10 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599 Reference 12: 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=51669610&loc=d3e8864-108599 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=51669610&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 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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