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Segment Information (Tables)
3 Months Ended
Mar. 31, 2021
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 March 31, 2021
Electric operating revenues$271,213 $93,494 $— $364,707 
Cost of energy88,886 26,510 — 115,396 
Utility margin182,327 66,984 — 249,311 
Other operating expenses107,328 27,769 1,174 136,271 
Depreciation and amortization41,949 22,190 5,735 69,874 
Operating income (loss)33,050 17,025 (6,909)43,166 
Interest income3,595 — (36)3,559 
Other income1,244 1,062 (376)1,930 
Interest charges(12,893)(8,475)(4,516)(25,884)
Segment earnings (loss) before income taxes
24,996 9,612 (11,837)22,771 
Income taxes (benefit)2,834 877 (2,145)1,566 
Segment earnings (loss)
22,162 8,735 (9,692)21,205 
Valencia non-controlling interest
(3,494)— — (3,494)
Subsidiary preferred stock dividends
(132)— — (132)
Segment earnings (loss) attributable to PNMR
$18,536 $8,735 $(9,692)$17,579 
At March 31, 2021:
Total Assets
$5,561,146 $2,163,250 $218,913 $7,943,309 
Goodwill
$51,632 $226,665 $— $278,297 
PNMTNMPCorporate
and Other
PNMR Consolidated
(In thousands)
Three Months Ended March 31, 2020
Electric operating revenues$248,133 $85,489 $— $333,622 
Cost of energy74,524 24,186 — 98,710 
Utility margin173,609 61,303 — 234,912 
Other operating expenses98,555 25,122 (5,476)118,201 
Depreciation and amortization41,449 21,836 5,688 68,973 
Operating income (loss)33,605 14,345 (212)47,738 
Interest income3,496 — (73)3,423 
Other income (deductions)(34,027)561 (540)(34,006)
Interest charges(17,629)(7,172)(5,633)(30,434)
Segment earnings (loss) before income taxes
(14,555)7,734 (6,458)(13,279)
Income taxes (benefit)(2,359)642 (163)(1,880)
Segment earnings (loss)
(12,196)7,092 (6,295)(11,399)
Valencia non-controlling interest
(3,729)— — (3,729)
Subsidiary preferred stock dividends
(132)— — (132)
Segment earnings (loss) attributable to PNMR
$(16,057)$7,092 $(6,295)$(15,260)
At March 31, 2020:
Total Assets
$5,260,528 $1,913,270 $201,321 $7,375,119 
Goodwill
$51,632 $226,665 $— $278,297