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Retirement benefits (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six months ended June 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,640

 
$
12,525

 
$
1,094

 
$
866

 
$
33,106

 
$
24,652

 
$
1,963

 
$
1,749

Interest cost
 
19,363

 
18,113

 
2,268

 
2,117

 
38,502

 
36,114

 
4,503

 
4,277

Expected return on plan assets
 
(22,149
)
 
(20,334
)
 
(2,934
)
 
(2,748
)
 
(44,300
)
 
(40,681
)
 
(5,841
)
 
(5,456
)
Amortization of net prior service loss (gain)
 
1

 
22

 
(449
)
 
(449
)
 
2

 
44

 
(897
)
 
(897
)
Amortization of net actuarial loss (gain)
 
9,455

 
5,138

 
466

 
(3
)
 
18,417

 
10,176

 
896

 
(6
)
Net periodic benefit cost (credit)
 
23,310

 
15,464

 
445

 
(217
)
 
45,727

 
30,305

 
624

 
(333
)
Impact of PUC D&Os
 
(10,464
)
 
(3,651
)
 
(218
)
 
543

 
(19,977
)
 
(6,662
)
 
(120
)
 
988

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,846

 
$
11,813

 
$
227

 
$
326

 
$
25,750

 
$
23,643

 
$
504

 
$
655

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
16,148

 
$
12,101

 
$
1,080

 
$
840

 
$
32,131

 
$
23,798

 
$
1,935

 
$
1,696

Interest cost
 
17,749

 
16,553

 
2,191

 
2,038

 
35,265

 
32,989

 
4,350

 
4,117

Expected return on plan assets
 
(20,639
)
 
(18,158
)
 
(2,889
)
 
(2,707
)
 
(41,271
)
 
(36,329
)
 
(5,748
)
 
(5,370
)
Amortization of net prior service loss (gain)
 
10

 
16

 
(451
)
 
(451
)
 
20

 
31

 
(902
)
 
(902
)
Amortization of net actuarial loss
 
8,592

 
4,669

 
455

 
—

 
16,686

 
9,229

 
877

 
—

Net periodic benefit cost (credit)
 
21,860

 
15,181

 
386

 
(280
)
 
42,831

 
29,718

 
512

 
(459
)
Impact of PUC D&Os
 
(10,464
)
 
(3,651
)
 
(218
)
 
543

 
(19,977
)
 
(6,662
)
 
(120
)
 
988

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,396

 
$
11,530

 
$
168

 
$
263

 
$
22,854

 
$
23,056

 
$
392

 
$
529