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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of net periodic pension costs (NPPC) and net periodic benefit costs (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)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,800

 
$
17,223

 
$
573

 
$
680

 
$
46,564

 
$
51,764

 
$
1,656

 
$
2,041

Interest cost
 
21,150

 
19,340

 
2,006

 
1,986

 
63,216

 
58,033

 
6,000

 
5,947

Expected return on plan assets
 
(27,991
)
 
(27,237
)
 
(3,101
)
 
(3,224
)
 
(83,988
)
 
(81,715
)
 
(9,273
)
 
(9,683
)
Amortization of net prior service gain
 
(10
)
 
(11
)
 
(451
)
 
(451
)
 
(32
)
 
(32
)
 
(1,355
)
 
(1,354
)
Amortization of net actuarial (gains) losses
 
3,989

 
7,527

 
(3
)
 
25

 
11,667

 
22,556

 
(10
)
 
71

Net periodic pension/benefit cost (return)
 
12,938

 
16,842

 
(976
)
 
(984
)
 
37,427

 
50,606

 
(2,982
)
 
(2,978
)
Impact of PUC D&Os
 
11,554

 
7,785

 
821

 
953

 
36,111

 
17,621

 
2,443

 
3,048

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,492

 
$
24,627

 
$
(155
)
 
$
(31
)
 
$
73,538

 
$
68,227

 
$
(539
)
 
$
70

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,344

 
$
16,840

 
$
568

 
$
676

 
$
45,346

 
$
50,520

 
$
1,643

 
$
2,028

Interest cost
 
19,560

 
17,824

 
1,920

 
1,907

 
58,388

 
53,471

 
5,755

 
5,721

Expected return on plan assets
 
(26,146
)
 
(25,593
)
 
(3,064
)
 
(3,178
)
 
(78,474
)
 
(76,777
)
 
(9,135
)
 
(9,534
)
Amortization of net prior service (gain) cost
 
2

 
2

 
(451
)
 
(451
)
 
6

 
6

 
(1,353
)
 
(1,353
)
Amortization of net actuarial loss
 
3,841

 
6,826

 
—

 
25

 
10,993

 
20,477

 
—

 
74

Net periodic pension/benefit cost (return)
 
12,601

 
15,899

 
(1,027
)
 
(1,021
)
 
36,259

 
47,697

 
(3,090
)
 
(3,064
)
Impact of PUC D&Os
 
11,554

 
7,785

 
821

 
953

 
36,111

 
17,621

 
2,443

 
3,048

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,155

 
$
23,684

 
$
(206
)
 
$
(68
)
 
$
72,370

 
$
65,318

 
$
(647
)
 
$
(16
)