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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Summary of Financial Information by Segment
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
PNMTNMPCorporate
and Other		PNMR Consolidated
(In thousands)
Three Months Ended September 30, 2020
Electric operating revenues$364,504 $107,961 $— $472,465 
Cost of energy108,284 25,707 — 133,991 
Utility margin256,220 82,254 — 338,474 
Other operating expenses99,171 27,983 (4,885)122,269 
Depreciation and amortization40,509 22,492 5,399 68,400 
Operating income (loss)116,540 31,779 (514)147,805 
Interest income3,239 — (59)3,180 
Other income11,563 2,286 213 14,062 
Interest charges(14,747)(7,942)(4,574)(27,263)
Segment earnings (loss) before income taxes
116,595 26,123 (4,934)137,784 
Income taxes (benefit)13,591 2,202 (3,462)12,331 
Segment earnings (loss)
103,004 23,921 (1,472)125,453 
Valencia non-controlling interest
(3,553)— — (3,553)
Subsidiary preferred stock dividends
(132)— — (132)
Segment earnings (loss) attributable to PNMR
$99,319 $23,921 $(1,472)$121,768 
Nine Months Ended September 30, 2020
Electric operating revenues$873,425 $290,311 $— $1,163,736 
Cost of energy250,692 75,872 — 326,564 
Utility margin622,733 214,439 — 837,172 
Other operating expenses299,284 78,444 (14,644)363,084 
Depreciation and amortization123,721 66,696 16,978 207,395 
Operating income (loss)199,728 69,299 (2,334)266,693 
Interest income9,882 — (208)9,674 
Other income (deductions)(1,509)4,810 (542)2,759 
Interest charges(51,554)(22,475)(14,756)(88,785)
Segment earnings (loss) before income taxes
156,547 51,634 (17,840)190,341 
Income taxes (benefit)16,127 4,447 (5,848)14,726 
Segment earnings (loss)
140,420 47,187 (11,992)175,615 
Valencia non-controlling interest
(11,222)— — (11,222)
Subsidiary preferred stock dividends
(396)— — (396)
Segment earnings (loss) attributable to PNMR
$128,802 $47,187 $(11,992)$163,997 
At September 30, 2020:
Total Assets
$5,449,238 $2,075,291 $217,583 $7,742,112 
Goodwill
$51,632 $226,665 $— $278,297 
PNMTNMPCorporate
and Other		PNMR Consolidated
(In thousands)
Three Months Ended September 30, 2019
Electric operating revenues$331,113 $102,473 $— $433,586 
Cost of energy84,915 23,821 — 108,736 
Utility margin246,198 78,652 — 324,850 
Other operating expenses97,200 24,051 (5,291)115,960 
Depreciation and amortization40,545 22,005 5,800 68,350 
Operating income (loss)108,453 32,596 (509)140,540 
Interest income3,515 — (75)3,440 
Other income (deductions)770 1,766 (206)2,330 
Interest charges(18,492)(7,047)(4,820)(30,359)
Segment earnings (loss) before income taxes
94,246 27,315 (5,610)115,951 
Income taxes (benefit)9,525 2,228 (2,565)9,188 
Segment earnings (loss)
84,721 25,087 (3,045)106,763 
Valencia non-controlling interest
(3,860)— — (3,860)
Subsidiary preferred stock dividends
(132)— — (132)
Segment earnings (loss) attributable to PNMR
$80,729 $25,087 $(3,045)$102,771 
Nine Months Ended September 30, 2019
Electric operating revenues$838,649 $274,809 $— $1,113,458 
Cost of energy243,120 71,025 — 314,145 
Utility margin595,529 203,784 — 799,313 
Other operating expenses459,180 73,303 (16,589)515,894 
Depreciation and amortization119,581 62,722 17,468 199,771 
Operating income (loss)16,768 67,759 (879)83,648 
Interest income10,701 — (212)10,489 
Other income (deductions)19,307 3,083 (1,021)21,369 
Interest charges(55,379)(22,408)(13,998)(91,785)
Segment earnings (loss) before income taxes
(8,603)48,434 (16,110)23,721 
Income taxes (benefit)(31,984)3,982 (4,418)(32,420)
Segment earnings (loss)
23,381 44,452 (11,692)56,141 
Valencia non-controlling interest
(10,188)— — (10,188)
Subsidiary preferred stock dividends
(396)— — (396)
Segment earnings (loss) attributable to PNMR
$12,797 $44,452 $(11,692)$45,557 
At September 30, 2019:
Total Assets
$5,176,831 $1,832,066 $192,035 $7,200,932 
Goodwill
$51,632 $226,665 $— $278,297