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Benefit Plans and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Benefit Plans and Other Postretirement Benefits
Benefit Plans and Other Postretirement Benefits

Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended Sept. 30
 
 
2017
 
2016
 
2017
 
2016
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
1,154

 
$
1,104

 
$
7

 
$
6

Interest cost
 
1,554

 
1,704

 
147

 
163

Expected return on plan assets
 
(2,295
)
 
(2,289
)
 
(7
)
 
(6
)
Amortization of prior service cost (credit)
 
35

 
28

 
(88
)
 
(88
)
Amortization of net loss
 
1,462

 
1,348

 
109

 
83

Net benefit cost recognized for financial reporting
 
$
1,910

 
$
1,895

 
$
168

 
$
158


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended Sept. 30
 
 
2017
 
2016
 
2017
 
2016
(Thousands of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
3,463

 
$
3,312

 
$
21

 
$
18

Interest cost
 
4,663

 
5,112

 
443

 
489

Expected return on plan assets
 
(6,885
)
 
(6,867
)
 
(23
)
 
(18
)
Amortization of prior service cost (credit)
 
104

 
84

 
(264
)
 
(264
)
Amortization of net loss
 
4,385

 
4,044

 
327

 
249

Net benefit cost recognized for financial reporting
 
$
5,730

 
$
5,685

 
$
504

 
$
474



In January 2017, contributions of $150.0 million were made across four of Xcel Energy’s pension plans, of which $9.0 million was attributable to NSP-Wisconsin. Xcel Energy does not expect additional pension contributions during 2017.