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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2012
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | 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. PNMR SEGMENT INFORMATION
| PNM Electric |  | TNMP Electric |  | Corporate and Other |  | Consolidated
Three Months Ended September 30, 2012 | (In thousands)
Electric operating revenues | $ | 321,731 |  |  | $ | 68,680 |  |  | $ | — |  |  | $ | 390,411 |
Cost of energy | 99,217 |  |  | 11,560 |  |  | — |  |  | 110,777 |
Margin | 222,514 |  |  | 57,120 |  |  | — |  |  | 279,634 |
Other operating expenses | 101,104 |  |  | 22,331 |  |  | (4,771 | ) |  | 118,664 |
Depreciation and amortization | 24,437 |  |  | 13,819 |  |  | 4,564 |  |  | 42,820 |
Operating income | 96,973 |  |  | 20,970 |  |  | 207 |  |  | 118,150 |
Interest income | 3,173 |  |  | — |  |  | (43 | ) |  | 3,130 |
Other income (deductions) | 5,210 |  |  | 366 |  |  | (827 | ) |  | 4,749 |
Net interest charges | (19,230 | ) |  | (7,047 | ) |  | (4,238 | ) |  | (30,515 | )
Segment earnings (loss) before income taxes | 86,126 |  |  | 14,289 |  |  | (4,901 | ) |  | 95,514 |
Income taxes (benefit) | 31,235 |  |  | 5,205 |  |  | (2,902 | ) |  | 33,538 |
Segment earnings (loss) | 54,891 |  |  | 9,084 |  |  | (1,999 | ) |  | 61,976 |
Valencia non-controlling interest | (3,980 | ) |  | — |  |  | — |  |  | (3,980 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 50,779 |  |  | $ | 9,084 |  |  | $ | (1,999 | ) |  | $ | 57,864 |
Nine Months Ended September 30, 2012 |  |  |  |  |  |  |
Electric operating revenues | $ | 832,242 |  |  | $ | 187,404 |  |  | $ | — |  |  | $ | 1,019,646 |
Cost of energy | 263,009 |  |  | 34,333 |  |  | — |  |  | 297,342 |
Margin | 569,233 |  |  | 153,071 |  |  | — |  |  | 722,304 |
Other operating expenses | 311,468 |  |  | 64,239 |  |  | (12,676 | ) |  | 363,031 |
Depreciation and amortization | 72,017 |  |  | 37,173 |  |  | 13,099 |  |  | 122,289 |
Operating income (loss) | 185,748 |  |  | 51,659 |  |  | (423 | ) |  | 236,984 |
Interest income | 9,938 |  |  | 1 |  |  | (131 | ) |  | 9,808 |
Other income (deductions) | 9,201 |  |  | 1,244 |  |  | (4,797 | ) |  | 5,648 |
Net interest charges | (56,652 | ) |  | (21,214 | ) |  | (12,414 | ) |  | (90,280 | )
Segment earnings (loss) before income taxes | 148,235 |  |  | 31,690 |  |  | (17,765 | ) |  | 162,160 |
Income taxes (benefit) | 51,929 |  |  | 11,577 |  |  | (8,897 | ) |  | 54,609 |
Segment earnings (loss) | 96,306 |  |  | 20,113 |  |  | (8,868 | ) |  | 107,551 |
Valencia non-controlling interest | (10,699 | ) |  | — |  |  | — |  |  | (10,699 | )
Subsidiary preferred stock dividends | (396 | ) |  | — |  |  | — |  |  | (396 | )
Segment earnings (loss) attributable to PNMR | $ | 85,211 |  |  | $ | 20,113 |  |  | $ | (8,868 | ) |  | $ | 96,456 |
At September 30, 2012: |  |  |  |  |  |  |
Total Assets | $ | 4,073,331 |  |  | $ | 1,060,062 |  |  | $ | 126,814 |  |  | $ | 5,260,207 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
Additions to utility and non-utility plant included in accounts payable | $ | 6,056 |  |  | $ | 886 |  |  | $ | 1,063 |  |  | $ | 8,005 |
| PNM Electric |  | TNMP Electric |  | First Choice |  | Corporate and Other |  | Consolidated
Three Months Ended September 30, 2011 | (In thousands)
Electric revenues from non-affiliates | $ | 323,760 |  |  | $ | 54,787 |  |  | $ | 170,999 |  |  | $ | (48 | ) |  | $ | 549,498 |
Intersegment revenues | — |  |  | 12,196 |  |  | — |  |  | (12,196 | ) |  | — |
Total electric operating revenues | 323,760 |  |  | 66,983 |  |  | 170,999 |  |  | (12,244 | ) |  | 549,498 |
Cost of energy | 108,708 |  |  | 10,307 |  |  | 144,035 |  |  | (12,196 | ) |  | 250,854 |
Margin | 215,052 |  |  | 56,676 |  |  | 26,964 |  |  | (48 | ) |  | 298,644 |
Other operating expenses | 102,080 |  |  | 22,451 |  |  | 25,076 |  |  | (1,617 | ) |  | 147,990 |
Depreciation and amortization | 25,058 |  |  | 12,674 |  |  | 346 |  |  | 4,292 |  |  | 42,370 |
Operating income (loss) | 87,914 |  |  | 21,551 |  |  | 1,542 |  |  | (2,723 | ) |  | 108,284 |
Interest income | 3,770 |  |  | 1 |  |  | 29 |  |  | (52 | ) |  | 3,748 |
Other income (deductions) | (5,573 | ) |  | 313 |  |  | (115 | ) |  | (1,664 | ) |  | (7,039 | )
Net interest charges | (18,487 | ) |  | (7,276 | ) |  | (249 | ) |  | (5,112 | ) |  | (31,124 | )
Segment earnings (loss) before income taxes | 67,624 |  |  | 14,589 |  |  | 1,207 |  |  | (9,551 | ) |  | 73,869 |
Income taxes (benefit) | 25,052 |  |  | 5,721 |  |  | 594 |  |  | (5,403 | ) |  | 25,964 |
Segment earnings (loss) | 42,572 |  |  | 8,868 |  |  | 613 |  |  | (4,148 | ) |  | 47,905 |
Valencia non-controlling interest | (4,111 | ) |  | — |  |  | — |  |  | — |  |  | (4,111 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 38,329 |  |  | $ | 8,868 |  |  | $ | 613 |  |  | $ | (4,148 | ) |  | $ | 43,662 |
Nine Months Ended September 30, 2011 |  |  |  |  |  |  |  |  |
Electric revenues from non-affiliates | $ | 797,232 |  |  | $ | 150,175 |  |  | $ | 405,485 |  |  | $ | (145 | ) |  | $ | 1,352,747 |
Intersegment revenues | — |  |  | 30,608 |  |  | — |  |  | (30,608 | ) |  | — |
Total electric operating revenues | 797,232 |  |  | 180,783 |  |  | 405,485 |  |  | (30,753 | ) |  | 1,352,747 |
Cost of energy | 279,419 |  |  | 30,719 |  |  | 303,285 |  |  | (30,609 | ) |  | 582,814 |
Margin | 517,813 |  |  | 150,064 |  |  | 102,200 |  |  | (144 | ) |  | 769,933 |
Other operating expenses | 329,502 |  |  | 67,431 |  |  | 67,693 |  |  | (7,172 | ) |  | 457,454 |
Depreciation and amortization | 71,691 |  |  | 33,662 |  |  | 987 |  |  | 12,775 |  |  | 119,115 |
Operating income (loss) | 116,620 |  |  | 48,971 |  |  | 33,520 |  |  | (5,747 | ) |  | 193,364 |
Interest income | 12,052 |  |  | 1 |  |  | 63 |  |  | (106 | ) |  | 12,010 |
Other income (deductions) | 4,129 |  |  | 887 |  |  | (494 | ) |  | (4,913 | ) |  | (391 | )
Net interest charges | (54,593 | ) |  | (21,880 | ) |  | (535 | ) |  | (15,243 | ) |  | (92,251 | )
Segment earnings (loss) before income taxes | 78,208 |  |  | 27,979 |  |  | 32,554 |  |  | (26,009 | ) |  | 112,732 |
Income taxes (benefit) | 26,574 |  |  | 10,845 |  |  | 11,833 |  |  | (12,046 | ) |  | 37,206 |
Segment earnings (loss) | 51,634 |  |  | 17,134 |  |  | 20,721 |  |  | (13,963 | ) |  | 75,526 |
Valencia non-controlling interest | (10,764 | ) |  | — |  |  | — |  |  | — |  |  | (10,764 | )
Subsidiary preferred stock dividends | (396 | ) |  | — |  |  | — |  |  | — |  |  | (396 | )
Segment earnings (loss) attributable to PNMR | $ | 40,474 |  |  | $ | 17,134 |  |  | $ | 20,721 |  |  | $ | (13,963 | ) |  | $ | 64,366 |
At September 30, 2011: |  |  |  |  |  |  |  |  |
Total Assets | $ | 3,936,468 |  |  | $ | 1,041,613 |  |  | $ | 274,741 |  |  | $ | 119,818 |  |  | $ | 5,372,640 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | 43,013 |  |  | $ | — |  |  | $ | 321,310 |
Additions to utility and non-utility plant included in accounts payable | $ | 6,811 |  |  | $ | 4,672 |  |  | $ | 106 |  |  | $ | 253 |  |  | $ | 11,842 |

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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 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: 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 Reference 3: 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=14024403&loc=d3e13816-109267 Reference 4: 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 5: 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 6: 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 + Details
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