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Segment Information | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Information | Segment Information The following segment presentation is based on the methodology that management uses for making operating decisions and assessing performance of its various business activities. A reconciliation of the segment presentation to the GAAP financial statements is provided. PNM PNM includes the retail electric utility operations of PNM that are subject to traditional rate regulation by the NMPRC. PNM provides integrated electricity services that include the generation, transmission, and distribution of electricity for retail electric customers in New Mexico. PNM also includes the generation and sale of electricity into the wholesale market, as well as providing transmission services to third parties. The sale of electricity includes the asset optimization of PNM’s jurisdictional assets as well as the capacity excluded from retail rates. FERC has jurisdiction over wholesale and transmission rates. TNMP TNMP is an electric utility providing services in Texas under the TECA. TNMP’s operations are subject to traditional rate regulation by the PUCT. TNMP provides transmission and distribution services at regulated rates to various REPs that, in turn, provide retail electric service to consumers within TNMP’s service area. Corporate and Other The Corporate and Other segment includes PNMR holding company activities, primarily related to corporate level debt and PNMR Services Company. The activities of PNMR Development and NM Capital are also included in Corporate and Other. PNMR SEGMENT INFORMATION The following tables present summarized financial information for PNMR by segment. PNM and TNMP each operate in only one segment. Therefore, tabular segment information is not presented for PNM and TNMP.
2017 | PNM |  | TNMP |  | Corporate and Other |  | PNMR Consolidated
| (In thousands)
Electric operating revenues | $ | 1,104,230 |  |  | $ | 340,773 |  |  | $ | — |  |  | $ | 1,445,003 |
Cost of energy | 321,677 |  |  | 85,802 |  |  | — |  |  | 407,479 |
Utility margin | 782,553 |  |  | 254,971 |  |  | — |  |  | 1,037,524 |
Other operating expenses | 423,011 |  |  | 98,221 |  |  | (22,135 | ) |  | 499,097 |
Depreciation and amortization | 147,017 |  |  | 63,146 |  |  | 21,779 |  |  | 231,942 |
Operating income | 212,525 |  |  | 93,604 |  |  | 356 |  |  | 306,485 |
Interest income | 8,454 |  |  | — |  |  | 7,462 |  |  | 15,916 |
Other income (deductions) | 30,686 |  |  | 3,551 |  |  | (3,254 | ) |  | 30,983 |
Interest charges | (82,697 | ) |  | (30,084 | ) |  | (14,844 | ) |  | (127,625 | )
Segment earnings (loss) before income taxes | 168,968 |  |  | 67,071 |  |  | (10,280 | ) |  | 225,759 |
Income taxes | 81,555 |  |  | 31,512 |  |  | 17,273 |  |  | 130,340 |
Segment earnings (loss) | 87,413 |  |  | 35,559 |  |  | (27,553 | ) |  | 95,419 |
Valencia non-controlling interest | (15,017 | ) |  | — |  |  | — |  |  | (15,017 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | 71,868 |  |  | $ | 35,559 |  |  | $ | (27,553 | ) |  | $ | 79,874 |
At December 31, 2017: |  |  |  |  |  |  |
Total Assets | $ | 4,921,563 |  |  | $ | 1,500,770 |  |  | $ | 223,770 |  |  | $ | 6,646,103 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
2016 | PNM |  | TNMP |  | Corporate and Other |  | PNMR Consolidated
Electric operating revenues | $ | 1,035,913 |  |  | $ | 327,038 |  |  | $ | — |  |  | $ | 1,362,951 |
Cost of energy | 299,714 |  |  | 80,882 |  |  | — |  |  | 380,596 |
Utility margin | 736,199 |  |  | 246,156 |  |  | — |  |  | 982,355 |
Other operating expenses | 414,662 |  |  | 93,389 |  |  | (12,791 | ) |  | 495,260 |
Depreciation and amortization | 133,447 |  |  | 61,126 |  |  | 14,537 |  |  | 209,110 |
Operating income (loss) | 188,090 |  |  | 91,641 |  |  | (1,746 | ) |  | 277,985 |
Interest income | 10,173 |  |  | — |  |  | 12,120 |  |  | 22,293 |
Other income (deductions) | 22,066 |  |  | 3,202 |  |  | (1,739 | ) |  | 23,529 |
Interest charges | (87,469 | ) |  | (29,335 | ) |  | (11,829 | ) |  | (128,633 | )
Segment earnings (loss) before income taxes | 132,860 |  |  | 65,508 |  |  | (3,194 | ) |  | 195,174 |
Income taxes (benefit) | 40,922 |  |  | 23,836 |  |  | (1,480 | ) |  | 63,278 |
Segment earnings (loss) | 91,938 |  |  | 41,672 |  |  | (1,714 | ) |  | 131,896 |
Valencia non-controlling interest | (14,519 | ) |  | — |  |  | — |  |  | (14,519 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | 76,891 |  |  | $ | 41,672 |  |  | $ | (1,714 | ) |  | $ | 116,849 |
At December 31, 2016: |  |  |  |  |  |  |
Total Assets | $ | 4,867,546 |  |  | $ | 1,383,223 |  |  | $ | 220,311 |  |  | $ | 6,471,080 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
2015 | PNM |  | TNMP |  | Corporate and Other |  | PNMR Consolidated
Electric operating revenues | $ | 1,131,195 |  |  | $ | 307,887 |  |  | $ | — |  |  | $ | 1,439,082 |
Cost of energy | 391,131 |  |  | 73,518 |  |  | — |  |  | 464,649 |
Utility margin | 740,064 |  |  | 234,369 |  |  | — |  |  | 974,433 |
Other operating expenses | 590,967 |  |  | 88,051 |  |  | (14,854 | ) |  | 664,164 |
Depreciation and amortization | 115,717 |  |  | 56,285 |  |  | 13,917 |  |  | 185,919 |
Operating income | 33,380 |  |  | 90,033 |  |  | 937 |  |  | 124,350 |
Interest income | 6,574 |  |  | — |  |  | (76 | ) |  | 6,498 |
Other income (deductions) | 26,914 |  |  | 3,736 |  |  | (485 | ) |  | 30,165 |
Interest charges | (79,950 | ) |  | (27,681 | ) |  | (7,229 | ) |  | (114,860 | )
Segment earnings (loss) before income taxes | (13,082 | ) |  | 66,088 |  |  | (6,853 | ) |  | 46,153 |
Income taxes (benefit) | (12,758 | ) |  | 24,125 |  |  | 3,708 |  |  | 15,075 |
Segment earnings (loss) | (324 | ) |  | 41,963 |  |  | (10,561 | ) |  | 31,078 |
Valencia non-controlling interest | (14,910 | ) |  | — |  |  | — |  |  | (14,910 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | (15,762 | ) |  | $ | 41,963 |  |  | $ | (10,561 | ) |  | $ | 15,640 |
At December 31, 2015: |  |  |  |  |  |  |
Total Assets | $ | 4,599,344 |  |  | $ | 1,297,139 |  |  | $ | 112,845 |  |  | $ | 6,009,328 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
The Company defines utility margin as electric operating revenues less cost of energy. Cost of energy consists primarily of fuel and purchase power costs for PNM and costs charged by third-party transmission providers for TNMP. The Company believes that utility margin provides a more meaningful basis for evaluating operations than electric operating revenues since substantially all such costs are offset in revenues as fuel and purchase power costs are passed through to customers under PNM’s FPPAC and third-party transmission costs are passed on to customers through TNMP’s transmission cost recovery factor. Utility margin is not a financial measure required to be presented under GAAP and is considered a non-GAAP measure. Major Customers No individual customer accounted for more than 10% of the electric operating revenues of PNMR or PNM. Three REPs accounted for more than 10% of the electric operating revenues of TNMP, as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
REP A | 16 | % |  | 16 | % |  | 16 | %
REP B | 11 | % |  | 11 | % |  | 13 | %
REP C | 10 | % |  | 11 | % |  | 11 | %

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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 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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