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Document and Entity Information
 3 Months Ended
Mar. 31, 2015
Apr. 24, 2015
Document Information [Line Items]    
Entity Registrant Name PNM RESOURCES INC  
Entity Central Index Key 0001108426  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   79,653,624dei_EntityCommonStockSharesOutstanding
Public Service Company of New Mexico [Member]    
Document Information [Line Items]    
Entity Registrant Name PUBLIC SERVICE CO OF NEW MEXICO  
Entity Central Index Key 0000081023  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   39,117,799dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= pnm_PublicServiceCompanyOfNewMexicoMember
Texas-New Mexico Power Company [Member]    
Document Information [Line Items]    
Entity Registrant Name TEXAS NEW MEXICO POWER CO  
Entity Central Index Key 0000022767  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Common Stock, Shares Outstanding   6,358dei_EntityCommonStockSharesOutstanding
/ dei_LegalEntityAxis
= pnm_TexasNewMexicoPowerCompanyMember