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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Asset Retirement Obligations
A reconciliation of the ARO liability is as follows:
 
 
PNMR
 
PNM
 
TNMP
 
(In thousands)
Liability at December 31, 2011
$
79,233

 
$
78,425

 
$
699

Liabilities incurred
—

 
—

 
—

Liabilities settled
(25
)
 
—

 
(25
)
Accretion expense
6,685

 
6,617

 
58

Liability at December 31, 2012
85,893

 
85,042

 
732

Liabilities incurred
—

 
—

 
—

Liabilities settled
(79
)
 
(67
)
 
(12
)
Accretion expense
7,245

 
7,174

 
62

Revisions to estimated cash flows(1)
3,076

 
3,076

 
—

Liability at December 31, 2013
96,135

 
95,225

 
782

Liabilities incurred
—

 
—

 
—

Liabilities settled
—

 
—

 
—

Accretion expense
7,984

 
7,906

 
66

Revisions to estimated cash flows
51

 
51

 
—

Liability at December 31, 2014
$
104,170

 
$
103,182

 
$
848

 
(1) 
Based on studies to estimate the amount and timing of future ARO expenditures. PNM has an ARO for PVNGS that includes the obligations for nuclear decommissioning of that facility. In 2013, a new decommissioning study for PVNGS was implemented reflecting updated cash flow estimates, including the extended operating licenses. The new study resulted in an increase of $0.5 million to the ARO. In addition, a new decommissioning study for SJGS was implemented in 2013, resulting in a $2.5 million increase to the ARO.