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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of net periodic benefit cost 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)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
15,126

 
$
16,577

 
$
831

 
$
982

 
$
45,430

 
$
49,683

 
$
2,499

 
$
2,945

Interest cost
 
20,396

 
19,229

 
2,417

 
2,254

 
61,154

 
57,731

 
7,254

 
6,757

Expected return on plan assets
 
(24,640
)
 
(22,126
)
 
(3,064
)
 
(2,912
)
 
(73,920
)
 
(66,426
)
 
(9,207
)
 
(8,753
)
Amortization of net prior service loss (gain)
 
(15
)
 
1

 
(449
)
 
(448
)
 
(43
)
 
3

 
(1,345
)
 
(1,345
)
Amortization of net actuarial loss
 
6,228

 
9,191

 
200

 
450

 
18,605

 
27,608

 
603

 
1,346

Net periodic benefit cost
 
17,095

 
22,872

 
(65
)
 
326

 
51,226

 
68,599

 
(196
)
 
950

Impact of PUC D&Os
 
(4,653
)
 
(10,017
)
 
336

 
(60
)
 
(13,464
)
 
(29,994
)
 
1,008

 
(180
)
Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,442

 
$
12,855

 
$
271

 
$
266

 
$
37,762

 
$
38,605

 
$
812

 
$
770

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
14,699

 
$
16,066

 
$
821

 
$
967

 
$
44,097

 
$
48,197

 
$
2,463

 
$
2,902

Interest cost
 
18,702

 
17,632

 
2,334

 
2,175

 
56,106

 
52,897

 
7,003

 
6,525

Expected return on plan assets
 
(22,908
)
 
(20,635
)
 
(3,023
)
 
(2,873
)
 
(68,725
)
 
(61,906
)
 
(9,072
)
 
(8,621
)
Amortization of net prior service loss (gain)
 
3

 
10

 
(451
)
 
(450
)
 
10

 
30

 
(1,353
)
 
(1,352
)
Amortization of net actuarial loss
 
5,674

 
8,342

 
198

 
438

 
17,020

 
25,028

 
595

 
1,315

Net periodic benefit cost
 
16,170

 
21,415

 
(121
)
 
257

 
48,508

 
64,246

 
(364
)
 
769

Impact of PUC D&Os
 
(4,653
)
 
(10,017
)
 
336

 
(60
)
 
(13,464
)
 
(29,994
)
 
1,008

 
(180
)
Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,517

 
$
11,398

 
$
215

 
$
197

 
$
35,044

 
$
34,252

 
$
644

 
$
589