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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2013
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 March 31, 2013
(In thousands)
Electric operating revenues
$
257,894

 
$
59,771

 
$
—

 
$
317,665

Cost of energy
91,660

 
13,046

 
—

 
104,706

Margin
166,234

 
46,725

 
—

 
212,959

Other operating expenses
103,161

 
21,990

 
(3,703
)
 
121,448

Depreciation and amortization
25,834

 
11,681

 
3,292

 
40,807

Operating income
37,239

 
13,054

 
411

 
50,704

Interest income
2,673

 
—

 
(39
)
 
2,634

Other income (deductions)
1,407

 
208

 
(1,725
)
 
(110
)
Net interest charges
(19,957
)
 
(7,246
)
 
(4,094
)
 
(31,297
)
Segment earnings (loss) before income taxes
21,362

 
6,016

 
(5,447
)
 
21,931

Income taxes (benefit)
6,589

 
2,290

 
(910
)
 
7,969

Segment earnings (loss)
14,773

 
3,726

 
(4,537
)
 
13,962

Valencia non-controlling interest
(3,204
)
 
—

 
—

 
(3,204
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
11,437

 
$
3,726

 
$
(4,537
)
 
$
10,626

 
 
 
 
 
 
 
 
At March 31, 2013:
 
 
 
 
 
 
 
Total Assets
$
4,155,257

 
$
1,098,942

 
$
116,561

 
$
5,370,760

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

Additions to utility and non-utility plant included in accounts payable
$
8,211

 
$
1,055

 
$
12

 
$
9,278

 
PNM
Electric
 
TNMP
Electric
 
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

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