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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
PNMR SEGMENT INFORMATION
 
2012
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
Electric operating revenues
$
1,092,264

 
$
250,140

 
$
(1
)
 
$
1,342,403

Cost of energy
353,649

 
46,201

 
—

 
399,850

Margin
738,615

 
203,939

 
(1
)
 
942,553

Other operating expenses
435,442

 
87,079

 
(17,862
)
 
504,659

Depreciation and amortization
97,291

 
49,340

 
17,542

 
164,173

Operating income
205,882

 
67,520

 
319

 
273,721

Interest income
13,243

 
1

 
(172
)
 
13,072

Gain on sale of First Choice
—

 
—

 
1,012

 
1,012

Other income (deductions)
13,290

 
2,739

 
(7,954
)
 
8,075

Net interest charges
(76,101
)
 
(28,161
)
 
(16,583
)
 
(120,845
)
Earnings (loss) before income taxes
156,314

 
42,099

 
(23,378
)
 
175,035

Income taxes
50,713

 
15,352

 
(11,155
)
 
54,910

Earnings (loss) from continuing operations
105,601

 
26,747

 
(12,223
)
 
120,125

Valencia non-controlling interest
(14,050
)
 
—

 
—

 
(14,050
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) from continuing operations attributable to PNMR
$
91,023

 
$
26,747

 
$
(12,223
)
 
$
105,547

Gross property additions
$
196,800

 
$
92,973

 
$
19,136

 
$
308,909

At December 31, 2012:
 
 
 
 
 
 
 
Total Assets
$
4,163,907

 
$
1,086,229

 
$
122,447

 
$
5,372,583

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

Additions to utility plant and non-utility plant included in accounts payable
$
7,083

 
$
1,987

 
$
6,602

 
$
15,672

2011
PNM
 
TNMP
 
First
Choice
 
Corporate
and Other
 
Consolidated
 
 
 
 
 
(In thousands)
 
 
 
 
Operating revenues
$
1,057,289

 
$
204,045

 
$
439,450

 
$
(165
)
 
$
1,700,619

Intersegment revenues
—

 
33,813

 
—

 
(33,813
)
 
—

Total revenues
1,057,289

 
237,858

 
439,450

 
(33,978
)
 
1,700,619

Cost of energy
362,237

 
41,166

 
323,331

 
(33,812
)
 
692,922

Margin
695,052

 
196,692

 
116,119

 
(166
)
 
1,007,697

Other operating expenses
438,822

 
88,234

 
75,966

 
(9,671
)
 
593,351

Depreciation and amortization
94,787

 
44,616

 
1,098

 
16,546

 
157,047

Operating income (loss)
161,443

 
63,842

 
39,055

 
(7,041
)
 
257,299

Interest income
15,562

 
2

 
64

 
(113
)
 
15,515

Gain on sale of First Choice
—

 
—

 
—

 
174,925

 
174,925

Other income (deductions)
4,309

 
1,580

 
(650
)
 
(15,660
)
 
(10,421
)
Net interest charges
(75,349
)
 
(29,286
)
 
(581
)
 
(19,633
)
 
(124,849
)
Earnings (loss) before income taxes
105,965

 
36,138

 
37,888

 
132,478

 
312,469

Income taxes (benefit)
37,427

 
13,881

 
13,772

 
56,455

 
121,535

Earnings (loss) from continuing operations
68,538

 
22,257

 
24,116

 
76,023

 
190,934

Valencia non-controlling interest
(14,047
)
 
—

 
—

 
—

 
(14,047
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
—

 
(528
)
Segment earnings (loss) from continuing operations attributable to PNMR
$
53,963

 
$
22,257

 
$
24,116

 
$
76,023

 
$
176,359

Gross property additions
$
251,345

 
$
67,407

 
$
2,089

 
$
6,090

 
$
326,931

At December 31, 2011:
 
 
 
 
 
 
 
 
 
Total Assets
$
4,095,287

 
$
1,037,445

 
$
—

 
$
71,881

 
$
5,204,613

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
—

 
$
278,297

Additions to utility plant and non-utility plant included in accounts payable
$
26,815

 
$
4,736

 
$
—

 
$
2,104

 
$
33,655


2010
PNM
 
TNMP
 
First
Choice
 
Corporate
and Other
 
Consolidated
 
 
 
 
 
(In thousands)
 
 
 
 
Operating revenues
$
1,017,128

 
$
173,504

 
$
483,203

 
$
(318
)
 
$
1,673,517

Intersegment revenues
—

 
39,084

 
—

 
(39,084
)
 
—

Total revenues
1,017,128

 
212,588

 
483,203

 
(39,402
)
 
1,673,517

Cost of energy
352,270

 
37,064

 
350,476

 
(39,083
)
 
700,727

Margin
664,858

 
175,524

 
132,727

 
(319
)
 
972,790

Other operating expenses
424,455

 
77,387

 
92,077

 
(12,285
)
 
581,634

Depreciation and amortization
92,281

 
41,726

 
864

 
16,833

 
151,704

Operating income (loss)
148,122

 
56,411

 
39,786

 
(4,867
)
 
239,452

Interest income
18,854

 
1

 
18

 
23

 
18,896

Equity in net earnings (loss) of Optim Energy
—

 
—

 
—

 
(203,399
)
 
(203,399
)
Other income (deductions)
12,712

 
771

 
(411
)
 
(6,027
)
 
7,045

Net interest charges
(72,400
)
 
(31,157
)
 
(1,268
)
 
(20,548
)
 
(125,373
)
Earnings (loss) before income taxes
107,288

 
26,026

 
38,125

 
(234,818
)
 
(63,379
)
Income taxes (benefit)
36,427

 
10,044

 
14,064

 
(92,790
)
 
(32,255
)
Earnings (loss) from continuing operations
70,861

 
15,982

 
24,061

 
(142,028
)
 
(31,124
)
Valencia non-controlling interest
(13,563
)
 
—

 
—

 
—

 
(13,563
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
—

 
(528
)
Segment earnings (loss) from continuing operations attributable to PNMR
$
56,770

 
$
15,982

 
$
24,061

 
$
(142,028
)
 
$
(45,215
)
Gross property additions
$
226,766

 
$
41,018

 
$
3,046

 
$
10,658

 
$
281,488

At December 31, 2010:
 
 
 
 
 
 
 
 
 
Total Assets
$
3,875,573

 
$
1,010,957

 
$
218,411

 
$
120,142

 
$
5,225,083

Goodwill
$
51,632

 
$
226,665

 
$
43,013

 
$
—

 
$
321,310