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Segment Information (Tables)
 3 Months Ended
Mar. 31, 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
 
First
Choice
 
Corporate
and Other
 
Consolidated
Three Months Ended March 31, 2012
(In thousands)
Electric operating revenues
$
250,416

 
$
54,958

 
 
 
$
—

 
$
305,374

Cost of energy
80,557

 
11,290

 
 
 
—

 
91,847

Gross margin
169,859

 
43,668

 
 
 
—

 
213,527

Other operating expenses
104,120

 
20,590

 
 
 
(3,326
)
 
121,384

Depreciation and amortization
23,634

 
11,287

 
 
 
3,493

 
38,414

Operating income (loss)
42,105

 
11,791

 
 
 
(167
)
 
53,729

Interest income
3,335

 
—

 
 
 
(43
)
 
3,292

Other income (deductions)
4,982

 
105

 
 
 
(2,539
)
 
2,548

Net interest charges
(18,493
)
 
(7,097
)
 
 
 
(3,976
)
 
(29,566
)
Segment earnings (loss) before income taxes
31,929

 
4,799

 
 
 
(6,725
)
 
30,003

Income taxes (benefit)
10,852

 
1,788

 
 
 
(3,114
)
 
9,526

Segment earnings (loss)
21,077

 
3,011

 
 
 
(3,611
)
 
20,477

Valencia non-controlling interest
(3,265
)
 
—

 
 
 
—

 
(3,265
)
Subsidiary preferred stock dividends
(132
)
 
—

 
 
 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
17,680

 
$
3,011

 
 
 
$
(3,611
)
 
$
17,080

 
 
 
 
 
 
 
 
 
 
At March 31, 2012:
 
 
 
 
 
 
 
 
 
Total Assets
$
4,031,859

 
$
1,037,616

 
 
 
$
128,421

 
$
5,197,896

Goodwill
$
51,632

 
$
226,665

 
 
 
$
—

 
$
278,297

Additions to utility and non-utility plant included in accounts payable
$
18,296

 
$
801

 
 
 
$
673

 
$
19,770

Three Months Ended March 31, 2011
 
Electric revenues from non-affiliates
$
234,238

 
$
45,028

 
$
108,450

 
$
(53
)
 
$
387,663

Intersegment revenues
—

 
8,814

 
—

 
(8,814
)
 
—

Total electric operating revenues
234,238

 
53,842

 
108,450

 
(8,867
)
 
387,663

Cost of energy
89,214

 
10,153

 
67,954

 
(8,814
)
 
158,507

Gross margin
145,024

 
43,689

 
40,496

 
(53
)
 
229,156

Other operating expenses
103,124

 
19,703

 
18,987

 
(3,351
)
 
138,463

Depreciation and amortization
23,735

 
10,262

 
280

 
4,196

 
38,473

Operating income (loss)
18,165

 
13,724

 
21,229

 
(898
)
 
52,220

Interest income
4,057

 
—

 
4

 
(33
)
 
4,028

Other income (deductions)
5,217

 
316

 
(106
)
 
(1,602
)
 
3,825

Net interest charges
(18,080
)
 
(7,299
)
 
(146
)
 
(5,090
)
 
(30,615
)
Segment earnings (loss) before income taxes
9,359

 
6,741

 
20,981

 
(7,623
)
 
29,458

Income taxes (benefit)
2,395

 
2,578

 
7,492

 
(2,959
)
 
9,506

Segment earnings (loss)
6,964

 
4,163

 
13,489

 
(4,664
)
 
19,952

Valencia non-controlling interest
(3,183
)
 
—

 
—

 
—

 
(3,183
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
3,649

 
$
4,163

 
$
13,489

 
$
(4,664
)
 
$
16,637

 
 
 
 
 
 
 
 
 
 
At March 31, 2011:
 
 
 
 
 
 
 
 
 
     Total Assets
$
3,866,571

 
$
1,011,252

 
$
215,457

 
$
120,446

 
$
5,213,726

     Goodwill
$
51,632

 
$
226,665

 
$
43,013

 
$
—

 
$
321,310