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Regulatory and Rate Matters - Integrated Resource Plan (Details) - portfolio
12 Months Ended
May 04, 2016
Jul. 01, 2014
Dec. 31, 2017
Dec. 31, 2016
NMPRC [Member]        
Public Utilities, General Disclosures [Line Items]        
Period of action plan       4 years
Public Service Company of New Mexico [Member]        
Public Utilities, General Disclosures [Line Items]        
Required filing of Integrated Resource Plan       3 years
Planning period covered, IRP       20 years
Public Service Company of New Mexico [Member] | Scenario, Forecast [Member]        
Public Utilities, General Disclosures [Line Items]        
Planning period covered, IRP     20 years  
Period of action plan     4 years  
Number of resource portfolios (in portfolio)     2  
Public Service Company of New Mexico [Member] | Scenario, Forecast [Member] | San Juan Generating Station [Member]        
Public Utilities, General Disclosures [Line Items]        
Number of continued operations resource portfolios (in portfolio)     1  
Number of discontinued operations resource portfolios (in portfolio)     1  
Public Service Company of New Mexico [Member] | NMPRC [Member]        
Public Utilities, General Disclosures [Line Items]        
Period of action plan   4 years    
Period of time to show good cause why a docket should remain open 30 days