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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30
 
Nine months ended September 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
17,223

 
$
16,271

 
$
680

 
$
843

 
$
51,764

 
$
48,635

 
$
2,041

 
$
2,530

Interest cost
 
19,340

 
20,304

 
1,986

 
2,363

 
58,033

 
60,881

 
5,947

 
7,089

Expected return on plan assets
 
(27,237
)
 
(25,689
)
 
(3,224
)
 
(3,078
)
 
(81,715
)
 
(77,056
)
 
(9,683
)
 
(9,248
)
Amortization of net prior service gain
 
(11
)
 
(14
)
 
(451
)
 
(448
)
 
(32
)
 
(41
)
 
(1,354
)
 
(1,345
)
Amortization of net actuarial loss
 
7,527

 
6,638

 
25

 
283

 
22,556

 
19,858

 
71

 
848

Net periodic pension/benefit cost (return)
 
16,842

 
17,510

 
(984
)
 
(37
)
 
50,606

 
52,277

 
(2,978
)
 
(126
)
Impact of PUC D&Os
 
7,785

 
(4,534
)
 
953

 
346

 
17,621

 
(14,557
)
 
3,048

 
1,019

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,627

 
$
12,976

 
$
(31
)
 
$
309

 
$
68,227

 
$
37,720

 
$
70

 
$
893

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,840

 
$
15,764

 
$
676

 
$
839

 
$
50,520

 
$
47,294

 
$
2,028

 
$
2,515

Interest cost
 
17,824

 
18,659

 
1,907

 
2,279

 
53,471

 
55,974

 
5,721

 
6,837

Expected return on plan assets
 
(25,593
)
 
(23,973
)
 
(3,178
)
 
(3,037
)
 
(76,777
)
 
(71,919
)
 
(9,534
)
 
(9,110
)
Amortization of net prior service loss (gain)
 
2

 
2

 
(451
)
 
(451
)
 
6

 
6

 
(1,353
)
 
(1,353
)
Amortization of net actuarial loss
 
6,826

 
6,098

 
25

 
275

 
20,477

 
18,294

 
74

 
826

Net periodic pension/benefit cost (return)
 
15,899

 
16,550

 
(1,021
)
 
(95
)
 
47,697

 
49,649

 
(3,064
)
 
(285
)
Impact of PUC D&Os
 
7,785

 
(4,534
)
 
953

 
346

 
17,621

 
(14,557
)
 
3,048

 
1,019

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
23,684

 
$
12,016

 
$
(68
)
 
$
251

 
$
65,318

 
$
35,092

 
$
(16
)
 
$
734