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Retirement benefits (Tables)
 9 Months Ended
Sep. 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 September 30
 
Nine months ended September 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,271

 
$
15,126

 
$
843

 
$
831

 
$
48,635

 
$
45,430

 
$
2,530

 
$
2,499

Interest cost
 
20,304

 
20,396

 
2,363

 
2,417

 
60,881

 
61,154

 
7,089

 
7,254

Expected return on plan assets
 
(25,689
)
 
(24,640
)
 
(3,078
)
 
(3,064
)
 
(77,056
)
 
(73,920
)
 
(9,248
)
 
(9,207
)
Amortization of net prior service gain
 
(14
)
 
(15
)
 
(448
)
 
(449
)
 
(41
)
 
(43
)
 
(1,345
)
 
(1,345
)
Amortization of net actuarial loss
 
6,638

 
6,228

 
283

 
200

 
19,858

 
18,605

 
848

 
603

Net periodic pension/benefit cost
 
17,510

 
17,095

 
(37
)
 
(65
)
 
52,277

 
51,226

 
(126
)
 
(196
)
Impact of PUC D&Os
 
(4,534
)
 
(4,653
)
 
346

 
336

 
(14,557
)
 
(13,464
)
 
1,019

 
1,008

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
12,976

 
$
12,442

 
$
309

 
$
271

 
$
37,720

 
$
37,762

 
$
893

 
$
812

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,764

 
$
14,699

 
$
839

 
$
821

 
$
47,294

 
$
44,097

 
$
2,515

 
$
2,463

Interest cost
 
18,659

 
18,702

 
2,279

 
2,334

 
55,974

 
56,106

 
6,837

 
7,003

Expected return on plan assets
 
(23,973
)
 
(22,908
)
 
(3,037
)
 
(3,023
)
 
(71,919
)
 
(68,725
)
 
(9,110
)
 
(9,072
)
Amortization of net prior service loss (gain)
 
2

 
3

 
(451
)
 
(451
)
 
6

 
10

 
(1,353
)
 
(1,353
)
Amortization of net actuarial loss
 
6,098

 
5,674

 
275

 
198

 
18,294

 
17,020

 
826

 
595

Net periodic pension/benefit cost
 
16,550

 
16,170

 
(95
)
 
(121
)
 
49,649

 
48,508

 
(285
)
 
(364
)
Impact of PUC D&Os
 
(4,534
)
 
(4,653
)
 
346

 
336

 
(14,557
)
 
(13,464
)
 
1,019

 
1,008

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
12,016

 
$
11,517

 
$
251

 
$
215

 
$
35,092

 
$
35,044

 
$
734

 
$
644