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Retirement Plans and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Retirement Plans and Other Postretirement Benefits
Retirement Plans and Other Postretirement Benefits
 
Pinnacle West sponsors a qualified defined benefit and account balance pension plan, a non-qualified supplemental excess benefit retirement plan, and an other postretirement benefit plan for the employees of Pinnacle West and our subsidiaries.  Pinnacle West uses a December 31 measurement date for its pension and other postretirement benefit plans.  The market-related value of our plan assets is their fair value at the measurement dates.

The following table provides details of the plans’ net periodic benefit costs and the portion of these costs charged to expense (including administrative costs and excluding amounts capitalized as overhead construction or billed to electric plant participants) (dollars in thousands):

 
Pension Benefits
 
Other Benefits
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Service cost — benefits earned during the period
$
13,859

 
$
12,408

 
$
28,116

 
$
24,951

 
$
5,401

 
$
4,470

 
$
11,118

 
$
9,184

Non-service costs (credits):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest cost on benefit obligation
29,522

 
34,069

 
59,283

 
68,421

 
6,417

 
7,421

 
12,929

 
14,947

Expected return on plan assets
(46,915
)
 
(43,049
)
 
(93,721
)
 
(85,942
)
 
(10,019
)
 
(9,603
)
 
(20,038
)
 
(19,206
)
  Amortization of:
 

 
 
 
 

 
 

 
 

 
 

 
 

 
 

  Prior service credit
—

 
—

 
—

 
—

 
(9,394
)
 
(9,455
)
 
(18,788
)
 
(18,910
)
  Net actuarial loss
8,295

 
10,053

 
17,306

 
21,292

 
—

 
—

 
—

 
—

Net periodic benefit cost (credit)
$
4,761

 
$
13,481

 
$
10,984

 
$
28,722

 
$
(7,595
)
 
$
(7,167
)
 
$
(14,779
)
 
$
(13,985
)
Portion of cost (credit) charged to expense
$
271

 
$
7,000

 
$
1,613

 
$
15,244

 
$
(5,056
)
 
$
(5,063
)
 
$
(10,512
)
 
$
(9,880
)

 
Contributions
 
We have not made voluntary contributions to our pension plan year-to-date in 2020. The minimum required contributions for the pension plan are zero for the next three years. We expect to make voluntary contributions up to $100 million per year during the 2020-2022 period. We do not expect to make any contributions over the next three years to our other postretirement benefit plans.