Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows From Operating Activities:
Net Earnings	$ 13,962	$ 20,477
Net Earnings	10,626	17,080
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	51,818	48,777
Deferred income tax expense	7,795	9,601
Net unrealized (gains) losses on derivatives	4,902	(3,502)
Realized (gains) losses on investments held by NDT	(1,533)	(4,454)
Stock based compensation expense	1,903	1,236
Other, net	(348)	(471)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	4,062	13,671
Materials, supplies, and fuel stock	944	(3,058)
Other current assets	2,335	1,854
Other assets	8,774	(270)
Accounts payable	(17,895)	737
Interest and taxes	25,430	20,749
Other current liabilities	(38,761)	(29,474)
Proceeds from governmental grants	0	20,859
Other liabilities	(64,763)	(83,129)
Net cash flows from operating activities	(1,375)	13,603
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(73,584)	(84,018)
Proceeds from sales of investments held by NDT	14,284	26,760
Purchases of investments held by NDT	(15,122)	(27,395)
Return of principal on PVNGS lessor notes	10,965	12,632
Other, net	1,241	2,431
Net cash flows from investing activities	(62,216)	(69,590)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	84,600	67,100
Proceeds from stock option exercise	2,293	5,005
Purchases to satisfy awards of common stock	(9,651)	(11,088)
Dividends paid	(11,683)	(10,089)
Valencia's transactions with its owner	(5,260)	(4,009)
Other, net	(584)	953
Net cash flows from financing activities	59,715	47,872
Change in Cash and Cash Equivalents	(3,876)	(8,115)
Cash and Cash Equivalents at Beginning of Period	8,985	15,091
Cash and Cash Equivalents at End of Period	5,109	6,976
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	4,817	4,312
Income taxes paid (refunded), net	(603)	1,500
Public Service Company of New Mexico [Member]
Cash Flows From Operating Activities:
Net Earnings	14,773	21,077
Net Earnings	11,569	17,812
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	34,655	31,498
Deferred income tax expense	6,685	10,852
Net unrealized (gains) losses on derivatives	4,902	(3,502)
Realized (gains) losses on investments held by NDT	(1,533)	(4,454)
Other, net	(343)	(195)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	5,467	9,920
Materials, supplies, and fuel stock	879	(3,117)
Other current assets	(84)	402
Other assets	8,772	(1,533)
Accounts payable	(18,857)	1,014
Interest and taxes	20,932	81,263
Other current liabilities	(44,068)	(18,379)
Proceeds from governmental grants	0	20,859
Other liabilities	(64,893)	(78,133)
Net cash flows from operating activities	(32,713)	67,572
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(44,389)	(66,668)
Proceeds from sales of investments held by NDT	14,284	26,760
Purchases of investments held by NDT	(15,122)	(27,395)
Return of principal on PVNGS lessor notes	10,965	12,632
Other, net	1,214	180
Net cash flows from investing activities	(33,048)	(54,491)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), net	67,800	(21,900)
Dividends paid	(132)	(132)
Valencia's transactions with its owner	(5,260)	(4,009)
Other, net	(584)	953
Net cash flows from financing activities	61,824	(25,088)
Change in Cash and Cash Equivalents	(3,937)	(12,007)
Cash and Cash Equivalents at Beginning of Period	3,958	12,307
Cash and Cash Equivalents at End of Period	21	300
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	4,304	4,141
Income taxes paid (refunded), net	0	(63,114)
Texas-New Mexico Power Company [Member]
Cash Flows From Operating Activities:
Net Earnings	3,726	3,011
Adjustments to reconcile net earnings to net cash flows from operating activities:
Depreciation and amortization	12,686	12,604
Deferred income tax expense	2,448	1,720
Other, net	0	(276)
Changes in certain assets and liabilities:
Accounts receivable and unbilled revenues	(1,405)	3,751
Materials, supplies, and fuel stock	65	60
Other current assets	218	(721)
Other assets	(58)	(50)
Accounts payable	4,130	(1,966)
Interest and taxes	686	2,451
Other current liabilities	(1,278)	2,393
Other liabilities	1,076	(4,496)
Net cash flows from operating activities	22,294	18,481
Cash Flows From Investing Activities:
Additions to utility and non-utility plant	(24,594)	(13,082)
Net cash flows from investing activities	(24,594)	(13,082)
Cash Flows From Financing Activities:
Short-term borrowings (repayments), affiliate, net	25,000	0
Long-term borrowings	(22,700)	(700)
Net cash flows from financing activities	2,300	(700)
Change in Cash and Cash Equivalents	0	4,699
Cash and Cash Equivalents at Beginning of Period	1	1
Cash and Cash Equivalents at End of Period	1	4,700
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	171	104
Income taxes paid (refunded), net	$ (604)	$ (1,952)