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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [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)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,870

 
$
14,913

 
$
847

 
$
832

 
$
32,364

 
$
30,304

 
$
1,687

 
$
1,668

Interest cost
 
20,361

 
20,481

 
2,315

 
2,363

 
40,577

 
40,758

 
4,726

 
4,837

Expected return on plan assets
 
(25,646
)
 
(24,616
)
 
(3,104
)
 
(3,091
)
 
(51,367
)
 
(49,280
)
 
(6,170
)
 
(6,143
)
Amortization of net prior service gain
 
(13
)
 
(14
)
 
(448
)
 
(448
)
 
(27
)
 
(28
)
 
(897
)
 
(896
)
Amortization of net actuarial loss
 
6,707

 
6,408

 
199

 
116

 
13,220

 
12,377

 
565

 
403

Net periodic pension/benefit cost
 
17,279

 
17,172

 
(191
)
 
(228
)
 
34,767

 
34,131

 
(89
)
 
(131
)
Impact of PUC D&Os
 
(4,867
)
 
(4,765
)
 
527

 
483

 
(10,023
)
 
(8,811
)
 
673

 
672

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
12,412

 
$
12,407

 
$
336

 
$
255

 
$
24,744

 
$
25,320

 
$
584

 
$
541

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,436

 
$
14,465

 
$
841

 
$
820

 
$
31,530

 
$
29,398

 
$
1,676

 
$
1,642

Interest cost
 
18,726

 
18,801

 
2,231

 
2,280

 
37,315

 
37,404

 
4,558

 
4,669

Expected return on plan assets
 
(23,935
)
 
(22,885
)
 
(3,056
)
 
(3,046
)
 
(47,946
)
 
(45,817
)
 
(6,073
)
 
(6,049
)
Amortization of net prior service loss (gain)
 
2

 
3

 
(451
)
 
(451
)
 
4

 
7

 
(902
)
 
(902
)
Amortization of net actuarial loss
 
6,190

 
5,885

 
192

 
113

 
12,196

 
11,346

 
551

 
397

Net periodic pension/benefit cost
 
16,419

 
16,269

 
(243
)
 
(284
)
 
33,099

 
32,338

 
(190
)
 
(243
)
Impact of PUC D&Os
 
(4,867
)
 
(4,765
)
 
527

 
483

 
(10,023
)
 
(8,811
)
 
673

 
672

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
11,552

 
$
11,504

 
$
284

 
$
199

 
$
23,076

 
$
23,527

 
$
483

 
$
429