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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 322,758 | $ 390,411 | $ 323,860 | $ 305,374 | $ 347,872 |  | $ 549,498 |  | $ 415,586 |  | $ 387,663 |  | $ 1,342,403 | $ 1,700,619 | $ 1,673,517
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,619 | 1,673,517
Cost of energy |  |  |  |  |  |  |  |  |  |  |  |  | 399,850 | 692,922 | 700,727
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 942,553 | 1,007,697 | 972,790
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 504,659 | 593,351 | 581,634
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 164,173 | 157,047 | 151,704
Operating income | 36,736 | 118,150 | 65,106 | 53,729 | 63,935 |  | 108,284 |  | 32,860 |  | 52,220 |  | 273,721 | 257,299 | 239,452
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 13,072 | 15,515 | 18,896
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  |  |  | 1,012 | 174,925 | 0
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (203,399)
Other income (deductions) |  |  |  |  |  |  |  |  |  |  |  |  | 8,075 | (10,421) | 7,045
Net interest charges |  |  |  |  |  |  |  |  |  |  |  |  | (120,845) | (124,849) | (125,373)
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 175,035 | 312,469 | (63,379)
Income Taxes (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 54,910 | 121,535 | (32,255)
Net earnings | 12,573 | 61,976 | 25,099 | 20,477 | 115,408 | [1] | 47,905 | [1] | 7,669 | [1] | 19,952 | [1] | 120,125 | 190,934 | (31,124)
Earnings (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (31,124)
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | (14,050) | (14,047) | (13,563)
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) from continuing operations attributable to PNMR (excluding discontinued operations amounts related to sale of PNM Gas) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,215)
Net Earnings (Loss) Attributable to PNMR | 9,091 | 57,864 | 21,512 | 17,080 | 111,993 |  | 43,662 |  | 4,067 |  | 16,637 |  | 105,547 | 176,359 | (45,215)
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  | 308,909 | 326,931 | 281,488
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 281,488
Total Assets | 5,372,583 |  |  |  | 5,204,613 |  |  |  |  |  |  |  | 5,372,583 | 5,204,613 | 5,225,083
Goodwill | 278,297 |  |  |  | 278,297 |  |  |  |  |  |  |  | 278,297 | 278,297 | 321,310
Additions to utility and non-utility plant included in accounts payable | 15,672 |  |  |  | 33,655 |  |  |  |  |  |  |  | 15,672 | 33,655 |
PNM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 1,092,264 | 1,057,289 | 1,017,128
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,057,289 | 1,017,128
Cost of energy |  |  |  |  |  |  |  |  |  |  |  |  | 353,649 | 362,237 | 352,270
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 738,615 | 695,052 | 664,858
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 435,442 | 438,822 | 424,455
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 97,291 | 94,787 | 92,281
Operating income |  |  |  |  |  |  |  |  |  |  |  |  | 205,882 | 161,443 | 148,122
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 13,243 | 15,562 | 18,854
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Other income (deductions) |  |  |  |  |  |  |  |  |  |  |  |  | 13,290 | 4,309 | 12,712
Net interest charges |  |  |  |  |  |  |  |  |  |  |  |  | (76,101) | (75,349) | (72,400)
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 156,314 | 105,965 | 107,288
Income Taxes (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 50,713 | 37,427 | 36,427
Net earnings |  |  |  |  |  |  |  |  |  |  |  |  | 105,601 | 68,538 |
Earnings (loss) from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,861
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | (14,050) | (14,047) | (13,563)
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Segment earnings (loss) from continuing operations attributable to PNMR (excluding discontinued operations amounts related to sale of PNM Gas) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,770
Net Earnings (Loss) Attributable to PNMR |  |  |  |  |  |  |  |  |  |  |  |  | 91,023 | 53,963 |
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  | 196,800 | 251,345 |
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 226,766
Total Assets | 4,163,907 |  |  |  | 4,095,287 |  |  |  |  |  |  |  | 4,163,907 | 4,095,287 | 3,875,573
Goodwill | 51,632 |  |  |  | 51,632 |  |  |  |  |  |  |  | 51,632 | 51,632 | 51,632
Additions to utility and non-utility plant included in accounts payable | 7,083 |  |  |  | 26,815 |  |  |  |  |  |  |  | 7,083 | 26,815 |
TNMP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | 250,140 | 204,045 | 173,504
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,813 | 39,084
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 237,858 | 212,588
Cost of energy |  |  |  |  |  |  |  |  |  |  |  |  | 46,201 | 41,166 | 37,064
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | 203,939 | 196,692 | 175,524
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 87,079 | 88,234 | 77,387
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 49,340 | 44,616 | 41,726
Operating income |  |  |  |  |  |  |  |  |  |  |  |  | 67,520 | 63,842 | 56,411
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 1
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Other income (deductions) |  |  |  |  |  |  |  |  |  |  |  |  | 2,739 | 1,580 | 771
Net interest charges |  |  |  |  |  |  |  |  |  |  |  |  | (28,161) | (29,286) | (31,157)
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | 42,099 | 36,138 | 26,026
Income Taxes (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 15,352 | 13,881 | 10,044
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Earnings (Loss) Attributable to PNMR |  |  |  |  |  |  |  |  |  |  |  |  | 26,747 | 22,257 | 15,982
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  | 92,973 | 67,407 |
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,018
Total Assets | 1,086,229 |  |  |  | 1,037,445 |  |  |  |  |  |  |  | 1,086,229 | 1,037,445 | 1,010,957
Goodwill | 226,665 |  |  |  | 226,665 |  |  |  |  |  |  |  | 226,665 | 226,665 | 226,665
Additions to utility and non-utility plant included in accounts payable | 1,987 |  |  |  | 4,736 |  |  |  |  |  |  |  | 1,987 | 4,736 |
First Choice [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 439,450 | 483,203
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | 439,450 | 483,203
Cost of energy |  |  |  |  |  |  |  |  |  |  |  |  |  | 323,331 | 350,476
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,119 | 132,727
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,966 | 92,077
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,098 | 864
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,055 | 39,786
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  | 64 | 18
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Other income (deductions) |  |  |  |  |  |  |  |  |  |  |  |  |  | (650) | (411)
Net interest charges |  |  |  |  |  |  |  |  |  |  |  |  |  | (581) | (1,268)
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,888 | 38,125
Income Taxes (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,772 | 14,064
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0
Net Earnings (Loss) Attributable to PNMR |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,116 | 24,061
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,089 |
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,046
Total Assets |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 218,411
Goodwill |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 | 43,013
Additions to utility and non-utility plant included in accounts payable |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 |
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | (1) | (165) | (318)
Intersegment revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,813) | (39,084)
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,978) | (39,402)
Cost of energy |  |  |  |  |  |  |  |  |  |  |  |  | 0 | (33,812) | (39,083)
Gross margin |  |  |  |  |  |  |  |  |  |  |  |  | (1) | (166) | (319)
Other operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | (17,862) | (9,671) | (12,285)
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  | 17,542 | 16,546 | 16,833
Operating income |  |  |  |  |  |  |  |  |  |  |  |  | 319 | (7,041) | (4,867)
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | (172) | (113) | 23
Gain on sale of First Choice |  |  |  |  |  |  |  |  |  |  |  |  | 1,012 | 174,925 |
Equity in net earnings (loss) of Optim Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (203,399)
Other income (deductions) |  |  |  |  |  |  |  |  |  |  |  |  | (7,954) | (15,660) | (6,027)
Net interest charges |  |  |  |  |  |  |  |  |  |  |  |  | (16,583) | (19,633) | (20,548)
Earnings (Loss) before Income Taxes |  |  |  |  |  |  |  |  |  |  |  |  | (23,378) | 132,478 | (234,818)
Income Taxes (Benefit) |  |  |  |  |  |  |  |  |  |  |  |  | (11,155) | 56,455 | (92,790)
Valencia non-controlling interest |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Preferred Stock Dividend Requirements of Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Earnings (Loss) Attributable to PNMR |  |  |  |  |  |  |  |  |  |  |  |  | (12,223) | 76,023 | (142,028)
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  | 19,136 | 6,090 |
Gross property additions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,658
Total Assets | 122,447 |  |  |  | 71,881 |  |  |  |  |  |  |  | 122,447 | 71,881 | 120,142
Goodwill | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 | 0
Additions to utility and non-utility plant included in accounts payable | $ 6,602 |  |  |  | $ 2,104 |  |  |  |  |  |  |  | $ 6,602 | $ 2,104 |
[1] | During the fourth quarter of 2011, PNMR completed the sale of First Choice which resulted in a $174.9 million ($97.0 million after-tax) gain, that positively affected net earnings, net earnings attributable to PNMR, and earnings per share. See Note 3.

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