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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of Asset Retirement Obligations
A reconciliation of the ARO liability is as follows:
 
 
PNMR
 
PNM
 
TNMP
 
(In thousands)
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

Liabilities incurred
—

 
—

 
—

Liabilities settled
(730
)
 
(506
)
 
(224
)
Accretion expense
8,625

 
8,543

 
71

Revisions to estimated cash flows(1)
(170
)
 
(170
)
 
—

Liability at December 31, 2015
111,895

 
111,049

 
695

Liabilities incurred
—

 
—

 
—

Liabilities settled
(14
)
 
(14
)
 
—

Accretion expense
9,170

 
9,098

 
59

Revisions to estimated cash flows(2)
6,468

 
6,468

 
—

Liability at December 31, 2016
$
127,519

 
$
126,601

 
$
754


(1)  PNM has an ARO for Four Corners that includes the obligations for decommissioning of that facility. In 2015, a new decommissioning study for Four Corners was implemented reflecting updated cash flow estimates. The new study resulted in an increase of $1.0 million to the ARO. In addition, a new decommissioning study for SJGS was implemented in 2015, resulting in a $1.2 million decrease to the ARO.
(2) 
PNM has an ARO for PVNGS that includes obligations for nuclear decommissioning of that facility. In 2016, a new decommissioning study for PVNGS was implemented reflecting updated cash flow estimates. The new study resulted in an increase of $6.1 million to the ARO. In addition, an adjustment for SJGS related to the 2015 decommissioning study was implemented in 2016, resulting in a $0.3 million increase to the ARO.