XML 120 R95.htm IDEA: XBRL DOCUMENT v2.4.0.6

Construction Program and Jointly-Owned Electric Generating Plants Construction Program and Jointly-Owned Electric Generating Plants (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Construction Expenditures	$ 308,909,000		$ 326,931,000	$ 281,488,000
Public Utilities, Property, Plant and Equipment, Plant in Service	5,313,796,000		5,120,167,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1,774,223,000)		(1,705,520,000)
Operating Lease, Extended Term	2 years
Public Service Company of New Mexico [Member]
Construction Expenditures	196,800,000		251,345,000	226,766,000
Public Utilities, Property, Plant and Equipment, Plant in Service	4,133,532,000		4,009,873,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(1,355,240,000)		(1,305,754,000)
Texas-New Mexico Power Company [Member]
Construction Expenditures	92,973,000		67,407,000	41,018,000
Public Utilities, Property, Plant and Equipment, Plant in Service	1,009,108,000		947,327,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(339,315,000)		(323,123,000)
Joint Projects [Member] | PNMR [Member]
Construction Expenditures	308,900,000
Joint Projects [Member] | Public Service Company of New Mexico [Member]
Construction Expenditures	196,800,000
Joint Projects [Member] | Texas-New Mexico Power Company [Member]
Construction Expenditures	93,000,000
Four Corners Units 4 and 5 (Coal) [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Property, Plant and Equipment, Plant in Service	152,873,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(100,010,000)
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	5,988,000
Jointly Owned Utility Plant, Proportionate Ownership Share	13.00%
Environmental Upgrades Requirement Estimates	71,900,000
Luna (Gas) [Member] | Other Unrelated Entities 8 [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	33.30%
Luna (Gas) [Member] | Other Unrelated Entities 9 [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	33.30%
Luna (Gas) [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Property, Plant and Equipment, Plant in Service	62,778,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(15,195,000)
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	117,000
Jointly Owned Utility Plant, Proportionate Ownership Share	33.33%
SJGS Units 1 and 2 [Member] | Public Service Company of New Mexico [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 1 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	41.80%
SJGS (Coal) [Member] | Unit 3 [Member] | Other Unrelated Entities 2 [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	8.20%
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 3 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	28.80%
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 4 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	10.04%
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 5 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	8.475%
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 6 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	7.20%
SJGS (Coal) [Member] | Unit 4 [Member] | Other Unrelated Entities 7 [Member]
Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities	7.028%
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Property, Plant and Equipment, Plant in Service	978,575,000
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(401,866,000)
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	19,144,000
Jointly Owned Utility Plant, Proportionate Ownership Share	46.30%
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 3 [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
SJGS (Coal) [Member] | Public Service Company of New Mexico [Member] | Unit 4 [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share	38.457%
Palo Verde Nuclear Generating Station [Member] | Public Service Company of New Mexico [Member]
Public Utilities, Property, Plant and Equipment, Plant in Service	489,425,000	[1]
Public Utilities, Property, Plant and Equipment, Accumulated Depreciation	(132,781,000)	[1]
Public Utilities, Property, Plant and Equipment, Construction Work in Progress	$ 41,134,000	[1]
Jointly Owned Utility Plant, Proportionate Ownership Share	10.20%	[1]
Operating Lease, Original term	40 years
Number of operating units	3
Operating Lease, Extended Term	20 years
[1] (1) Includes interest in PVNGS Unit 3, interest in common facilities for all PVNGS units, and owned interests in PVNGS Units 1 and 2.

X

- Definition

Environmental Upgrades Requirement Estimates

+ References

No definition available.

+ Details

Name:	pnm_EnvironmentalUpgradesRequirementEstimates
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Jointly Owned Utility Plant Proportionate Ownership Share, Other Entities

+ References

No definition available.

+ Details

Name:	pnm_JointlyOwnedUtilityPlantProportionateOwnershipShareOtherEntities
Namespace Prefix:	pnm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of operating units

+ References

No definition available.

+ Details

Name:	pnm_NumberOfOperatingUnits
Namespace Prefix:	pnm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease, Extended Term

+ References

No definition available.

+ Details

Name:	pnm_OperatingLeaseExtendedTerm
Namespace Prefix:	pnm_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Operating Lease, Original Term

+ References

No definition available.

+ Details

Name:	pnm_OperatingLeaseOriginalTerm
Namespace Prefix:	pnm_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The proportionate share of interest (percent) in a jointly owned utility plant.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 10.C)

-URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 10

-Section C

+ Details

Name:	us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 17

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Period end book value of accumulated depreciation on property, plant and equipment (PPE) that is owned by the regulated operations of the public utility.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Period end amount of construction work in progress in public utility.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period end amount of total gross PPE.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesPropertyPlantAndEquipmentPlantInService
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant