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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of NPPC and NPBC for HEI consolidated and Hawaiian Electric consolidated were as follows:
 
 
Three months ended June 30
 
Six months ended June 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,382

 
$
17,428

 
$
542

 
$
692

 
$
30,764

 
$
34,541

 
$
1,083

 
$
1,361

Interest cost
 
21,033

 
19,459

 
1,997

 
2,030

 
42,066

 
38,693

 
3,994

 
3,961

Expected return on plan assets
 
(27,999
)
 
(27,224
)
 
(3,086
)
 
(3,267
)
 
(55,997
)
 
(54,478
)
 
(6,172
)
 
(6,459
)
Amortization of net prior service gain
 
(11
)
 
(11
)
 
(452
)
 
(451
)
 
(22
)
 
(21
)
 
(904
)
 
(903
)
Amortization of net actuarial (gains) losses
 
3,839

 
7,634

 
(4
)
 
48

 
7,678

 
15,029

 
(7
)
 
46

Net periodic pension/benefit cost (return)
 
12,244

 
17,286

 
(1,003
)
 
(948
)
 
24,489

 
33,764

 
(2,006
)
 
(1,994
)
Impact of PUC D&Os
 
12,278

 
7,179

 
811

 
1,024

 
24,557

 
9,836

 
1,622

 
2,095

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,522

 
$
24,465

 
$
(192
)
 
$
76

 
$
49,046

 
$
43,600

 
$
(384
)
 
$
101

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,001

 
$
17,007

 
$
538

 
$
688

 
$
30,002

 
$
33,680

 
$
1,075

 
$
1,352

Interest cost
 
19,414

 
17,937

 
1,918

 
1,955

 
38,828

 
35,647

 
3,835

 
3,814

Expected return on plan assets
 
(26,164
)
 
(25,577
)
 
(3,036
)
 
(3,216
)
 
(52,328
)
 
(51,184
)
 
(6,071
)
 
(6,356
)
Amortization of net prior service (gain) cost
 
2

 
2

 
(451
)
 
(451
)
 
4

 
4

 
(902
)
 
(902
)
Amortization of net actuarial loss
 
3,576

 
6,941

 
—

 
49

 
7,152

 
13,651

 
—

 
49

Net periodic pension/benefit cost (return)
 
11,829

 
16,310

 
(1,031
)
 
(975
)
 
23,658

 
31,798

 
(2,063
)
 
(2,043
)
Impact of PUC D&Os
 
12,278

 
7,179

 
811

 
1,024

 
24,557

 
9,836

 
1,622

 
2,095

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,107

 
$
23,489

 
$
(220
)
 
$
49

 
$
48,215

 
$
41,634

 
$
(441
)
 
$
52