The latest date the public utility can issue debt, in CCYY-MM-DD format.

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Carrying amount as of the balance sheet date of capitalized fuel costs of a regulated entity that are expected to be refunded through rate adjustments within one year or the normal operating cycle, if longer.

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Electric Capacity

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Minimum monthly bill charge for distributive generation customers.

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Represents the number of customers.

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Palo Verde Performance Award Period

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Time period given to public utility (by statutory right) to relate back for consumption, its new rates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Date the public utility's property, plant and equipment became operational, in CCYY-MM-DD format.

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Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program

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Amount of public utilities fuel reconciliation effect, net.

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Amount by which public utilities requested depreciation expense is increased (decreased).

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Public Utilities, Requested Performance Incentive Bonus Related To Energy Efficiency Program

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Amount by which public utilities amend requested rate increase (decrease) with regulatory agency.

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The execution date of a purchase and sale agreement, in CCYY-MM-DD format.

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Reconcilable Fuel Expense

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Time period given to public utility (by regulatory agency) to surcharge or to refund customers, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Identification of the contractual issuer of the debt instrument (for example, a subsidiary of the reporting entity).

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

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Date the entity disposed of a business or a group of assets, in CCYY-MM-DD format.

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The cash outflow for the purchase of investments that will be held in a decommissioning trust fund.

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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The end date for recovery of the individual regulatory current asset in a schedule of regulatory current assets.

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Regulation (Narrative) (Details)															3 Months Ended		6 Months Ended	9 Months Ended
Regulation (Narrative) (Details)	Nov. 02, 2017 USD ($)	Nov. 01, 2017	Oct. 31, 2017 USD ($)	Oct. 04, 2017 USD ($)	Jul. 21, 2017 USD ($)	Jun. 29, 2017	May 01, 2017 USD ($)	Feb. 22, 2017 USD ($)	Feb. 13, 2017 USD ($)	Jan. 10, 2017	Sep. 27, 2016 USD ($)	Aug. 25, 2016 USD ($)	Jul. 01, 2016 USD ($)	Jun. 08, 2016 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) MW	Sep. 30, 2016 USD ($)	Oct. 07, 2017 USD ($)	Dec. 31, 2016 USD ($)
Nuclear Decommissioning Funding, Annual Recovery																		$ 3,400,000	$ 3,400,000
Over-collection of fuel revenues															$ 3,020,000			$ 3,020,000			$ 255,000
PUCT
Period To Relate Back New Rates																		155 days
Public Utilities, Requested Rate Increase (Decrease), Amended Decrease Amount					$ 3,000,000
Over-collection of fuel revenues															$ 1,100,000			$ 1,100,000
Reconcilable Fuel Expense																		$ 223,300,000
PUCT \| Four Corners Generating Station
Purchase and Sale Agreement, Execution Date																		Feb. 17, 2015
PUCT \| Community Solar At Montana Power Station
Electric Capacity \| MW																		3
Number of customers subscribed															1,500			1,500
Property, Plant and Equipment, Operational Date																		May 31, 2017
PUCT \| Maximum
Surcharge Or Refund Period																		18 months
PUCT \| Four Corners Generating Station
Closing Date of Sale																		Jul. 06, 2016
PUCT \| Subsequent Event
Recovery of rate case expenses	$ 3,400,000
Surcharge Or Refund Period	3 years
Public Utilities, Requested Return on Equity, Percentage	9.65%
Minimum Distributive Generation Charge	$ 30.00
Nuclear Decommissioning Funding, Annual Recovery	2,100,000
Requested Depreciation Expense, Decrease	1,900,000
NMPRC
Over-collection of fuel revenues															$ 1,900,000			$ 1,900,000
Reconcilable Fuel Expense																		$ 160,900,000
Fuel Reconciliation Period																		33 months
NMPRC \| Holloman
Electric Capacity \| MW																		5
FERC
Debt Issuance Authorization Date Range Start																		Nov. 15, 2017
Debt Issuance Authorization Date Range End																		Nov. 14, 2019
FERC \| Subsequent Event
Debt Instrument, Face Amount			$ 350,000,000
Non-Fuel Base Rate \| PUCT
Public Utilities, Requested Rate Increase, Amount									$ 42,500,000
Public Utilities, Requested Rate Increase, Amended Amount					$ 39,200,000
Non-Fuel Base Rate \| PUCT \| Subsequent Event
Public Utilities, Requested Rate Increase, Amount	$ 14,500,000
2016 Energy Efficiency Programs \| PUCT
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program							$ 1,000,000
2016 Energy Efficiency Programs \| NMPRC
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program																	$ 400,000
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program															$ 400,000
Fixed Fuel Factor \| PUCT \| Subsequent Event
Increase (Decrease) In Fixed Fuel Factor, Percentage		(19.00%)
2017 Energy Efficiency Programs \| NMPRC
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program													$ 400,000
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program								$ 400,000
2015 Energy Efficiency Programs \| NMPRC
Public Utilities Requested Performance Incentive Bonus Related To Energy Efficiency Program													$ 300,000
Public Utilities Approved Performance Incentive Bonus Related To Energy Efficiency Program																$ 300,000
RGRT \| NMPRC
Debt Instrument, Issuer																		Rio Grande Resources Trust
RGRT \| NMPRC \| Subsequent Event
Debt Instrument, Face Amount																				$ 65,000,000
RGRT \| FERC
Debt Instrument, Issuer																		Rio Grande Resources Trust
RGRT \| FERC \| Subsequent Event
Debt Instrument, Face Amount			65,000,000
Public Utilities, Regulatory Rate Making Impact \| PUCT
Recovery of rate case expenses												$ 3,100,000
Period To Relate Back New Rates												80 days
Public Utilities, Regulatory Rate Making Impact \| NMPRC
Public Utilities, Approved Return on Equity, Percentage														9.48%
Public Utilities, Regulatory Rate Making Impact \| Non-Fuel Base Rate \| PUCT \| Four Corners Generating Station
Public Utilities, Approved Rate Increase, Amount												$ 3,700,000
Regulatory Current Asset, End Date for Recovery												Jul. 11, 2017
Public Utilities, Regulatory Rate Making Impact \| Non-Fuel Base Rate \| NMPRC
Public Utilities, Approved Rate Increase, Amount														$ 600,000
Public Utilities, Regulatory Rate Making Impact \| Utility Cost Of Service \| NMPRC
Public Utilities, Approved Rate Increase, Amount														$ 500,000
PUCT Docket No. 46610 \| Fixed Fuel Factor
Increase (Decrease) In Fixed Fuel Factor, Percentage										28.80%
PUCT Docket No. 46308
Reconcilable Fuel Expense											$ 436,600,000
Fuel Reconciliation Period						36 months					36 months
Fuel reconciliation effect, net amount																		$ 5,000,000
Palo Verde Performance Award Period																		3 years
NMPRC Case No. 15-00127-UT
Fuel Reconciliation Period														24 months
NMPRC Case No. 17-00217-UT \| NMPRC \| Subsequent Event
Debt Instrument, Face Amount				$ 350,000,000
7.25% 2009 Series A Refunding Bonds, due 2040 \| FERC \| Subsequent Event
Debt Instrument, Face Amount			$ 63,500,000
Debt Instrument, Interest Rate, Stated Percentage			7.25%
7.25% 2009 Series A Refunding Bonds, due 2040 \| NMPRC Case No. 17-00217-UT \| NMPRC \| Subsequent Event
Debt Instrument, Face Amount				$ 63,500,000
Debt Instrument, Interest Rate, Stated Percentage				7.25%
7.25% 2009 Series B Refunding Bonds, due 2040 \| FERC \| Subsequent Event
Debt Instrument, Face Amount			$ 37,100,000
Debt Instrument, Interest Rate, Stated Percentage			7.25%
7.25% 2009 Series B Refunding Bonds, due 2040 \| NMPRC Case No. 17-00217-UT \| NMPRC \| Subsequent Event
Debt Instrument, Face Amount				$ 37,100,000
Debt Instrument, Interest Rate, Stated Percentage				7.25%
Debt Instrument, Earliest Redemption Period \| 7.25% 2009 Series A Refunding Bonds, due 2040 \| FERC \| Subsequent Event
Debt Instrument, Redemption Period, Start Date			Feb. 01, 2019
Debt Instrument, Earliest Redemption Period \| 7.25% 2009 Series A Refunding Bonds, due 2040 \| NMPRC Case No. 17-00217-UT \| NMPRC \| Subsequent Event
Debt Instrument, Redemption Period, Start Date				Feb. 01, 2019
Debt Instrument, Earliest Redemption Period \| 7.25% 2009 Series B Refunding Bonds, due 2040 \| FERC \| Subsequent Event
Debt Instrument, Redemption Period, Start Date			Apr. 01, 2019
Debt Instrument, Earliest Redemption Period \| 7.25% 2009 Series B Refunding Bonds, due 2040 \| NMPRC Case No. 17-00217-UT \| NMPRC \| Subsequent Event
Debt Instrument, Redemption Period, Start Date				Apr. 01, 2019