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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2015
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)
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,577

 
$
12,306

 
$
982

 
$
870

 
$
49,683

 
$
36,958

 
$
2,945

 
$
2,619

Interest cost
 
19,229

 
18,044

 
2,254

 
2,137

 
57,731

 
54,158

 
6,757

 
6,414

Expected return on plan assets
 
(22,126
)
 
(20,337
)
 
(2,912
)
 
(2,724
)
 
(66,426
)
 
(61,018
)
 
(8,753
)
 
(8,180
)
Amortization of net prior service loss (gain)
 
1

 
22

 
(448
)
 
(448
)
 
3

 
66

 
(1,345
)
 
(1,345
)
Amortization of net actuarial loss (gain)
 
9,191

 
5,064

 
450

 
(2
)
 
27,608

 
15,240

 
1,346

 
(8
)
Net periodic benefit cost (credit)
 
22,872

 
15,099

 
326

 
(167
)
 
68,599

 
45,404

 
950

 
(500
)
Impact of PUC D&Os
 
(10,017
)
 
(3,331
)
 
(60
)
 
494

 
(29,994
)
 
(9,993
)
 
(180
)
 
1,482

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,855

 
$
11,768

 
$
266

 
$
327

 
$
38,605

 
$
35,411

 
$
770

 
$
982

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,066

 
$
11,900

 
$
967

 
$
848

 
$
48,197

 
$
35,698

 
$
2,902

 
$
2,544

Interest cost
 
17,632

 
16,495

 
2,175

 
2,058

 
52,897

 
49,484

 
6,525

 
6,175

Expected return on plan assets
 
(20,635
)
 
(18,167
)
 
(2,873
)
 
(2,684
)
 
(61,906
)
 
(54,496
)
 
(8,621
)
 
(8,054
)
Amortization of net prior service loss (gain)
 
10

 
15

 
(450
)
 
(451
)
 
30

 
46

 
(1,352
)
 
(1,353
)
Amortization of net actuarial loss
 
8,342

 
4,616

 
438

 
—

 
25,028

 
13,845

 
1,315

 
—

Net periodic benefit cost (credit)
 
21,415

 
14,859

 
257

 
(229
)
 
64,246

 
44,577

 
769

 
(688
)
Impact of PUC D&Os
 
(10,017
)
 
(3,331
)
 
(60
)
 
494

 
(29,994
)
 
(9,993
)
 
(180
)
 
1,482

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,398

 
$
11,528

 
$
197

 
$
265

 
$
34,252

 
$
34,584

 
$
589

 
$
794