Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows From Operating Activities:
Net Earnings	$ 45,345	$ 45,576
Net Earnings	38,304	38,592
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	103,914	99,971
Deferred income tax expense	27,797	21,354
Net unrealized (gains) losses on derivatives	1,729	1,978
Realized (gains) losses on investments held by NDT	(4,805)	(3,660)
Stock based compensation expense	3,198	1,435
Other, net	313	(820)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(23,021)	(20,901)
Materials, supplies, and fuel stock	(159)	(5,250)
Other current assets	3,870	(12,021)
Other assets	6,356	(6,659)
Accounts payable	(7,424)	(4,882)
Accrued interest and taxes	93,077	(9,944)
Other current liabilities	(21,310)	(3,016)
Proceeds from governmental grants	0	21,567
Other liabilities	(68,972)	(83,432)
Net cash flows from operating activities	159,908	41,296
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(153,512)	(156,796)
Proceeds from sales of investments held by NDT	76,106	45,787
Purchases of investments held by NDT	(77,868)	(47,313)
Return of principal on PVNGS lessor notes	10,965	12,632
Other, net	1,240	3,687
Net cash flows from investing activities	(143,069)	(142,003)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	1,300	124,300
Long-term borrowings	75,000	0
Repayment of long-term debt	9,445	0
Cash paid in debt exchange	(13,048)	0
Proceeds from stock option exercise	11,345	5,410
Purchases to satisfy awards of common stock	(19,741)	(12,674)
Dividends paid	(24,958)	(21,770)
Valencia's transactions with its owner	(8,675)	(7,449)
Other, net	(2,804)	983
Net cash flows from financing activities	8,974	88,800
Change in Cash and Cash Equivalents	25,813	(11,907)
Cash and Cash Equivalents at Beginning of Period	8,985	15,091
Cash and Cash Equivalents at End of Period	34,798	3,184
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	58,267	56,217
Income taxes paid (refunded), net	(95,472)	5,302
Supplemental schedule of noncash financing activities:
Premium on long-term debt incurred in connection with debt exchange	23,249
Public Service Company of New Mexico [Member]
Cash Flows From Operating Activities:
Net Earnings	44,470	41,417
Net Earnings	37,693	34,697
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	69,179	63,303
Deferred income tax expense	21,836	21,067
Net unrealized (gains) losses on derivatives	1,729	1,978
Realized (gains) losses on investments held by NDT	(4,805)	(3,660)
Other, net	(818)	(545)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(15,841)	(17,867)
Materials, supplies, and fuel stock	(238)	(5,152)
Other current assets	4,299	(10,885)
Other assets	6,196	(5,868)
Accounts payable	(5,829)	(7,112)
Accrued interest and taxes	45,380	61,503
Other current liabilities	(23,523)	10,095
Proceeds from governmental grants	0	21,567
Other liabilities	(69,059)	(78,105)
Net cash flows from operating activities	72,976	91,736
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(98,673)	(111,344)
Proceeds from sales of investments held by NDT	76,106	45,787
Purchases of investments held by NDT	(77,868)	(47,313)
Return of principal on PVNGS lessor notes	10,965	12,632
Other, net	1,213	1,372
Net cash flows from investing activities	(88,257)	(98,866)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	(21,100)	20,400
Long-term borrowings	75,000	0
Dividends paid	(264)	(17,944)
Valencia's transactions with its owner	(8,675)	(7,449)
Other, net	(1,169)	984
Net cash flows from financing activities	43,792	(4,009)
Change in Cash and Cash Equivalents	28,511	(11,139)
Cash and Cash Equivalents at Beginning of Period	3,958	12,307
Cash and Cash Equivalents at End of Period	32,469	1,168
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	37,845	36,286
Income taxes paid (refunded), net	(44,999)	(63,114)
Texas-New Mexico Power Company [Member]
Cash Flows From Operating Activities:
Net Earnings	12,065	11,029
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	26,034	25,885
Deferred income tax expense	4,348	6,247
Other, net	(10)	(258)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(7,180)	(3,034)
Materials, supplies, and fuel stock	79	(98)
Other current assets	(4,082)	(3,904)
Other assets	590	(1,066)
Accounts payable	807	2,987
Accrued interest and taxes	(1,517)	(4,755)
Other current liabilities	1,278	4,214
Other liabilities	886	(3,408)
Net cash flows from operating activities	33,298	33,839
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(47,390)	(39,595)
Proceeds from sales of utility plant	0	1,367
Net cash flows from investing activities	(47,390)	(38,228)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), affiliate, net	25,000	0
Long-term borrowings	7,500	7,400
Cash paid in debt exchange	(13,048)	0
Dividends paid	(3,726)	(3,010)
Other, net	(1,634)	(1)
Net cash flows from financing activities	14,092	4,389
Change in Cash and Cash Equivalents	0	0
Cash and Cash Equivalents at Beginning of Period	1
Cash and Cash Equivalents at End of Period	1
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	13,267	12,761
Income taxes paid (refunded), net	696	1,848
Supplemental schedule of noncash financing activities:
Premium on long-term debt incurred in connection with debt exchange	$ 23,249