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Retirement benefits (Tables)
 9 Months Ended
Sep. 30, 2014
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)
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
12,306

 
$
14,097

 
$
870

 
$
1,077

 
$
36,958

 
$
42,307

 
$
2,619

 
$
3,229

Interest cost
 
18,044

 
16,187

 
2,137

 
1,891

 
54,158

 
48,600

 
6,414

 
5,677

Expected return on plan assets
 
(20,337
)
 
(18,134
)
 
(2,724
)
 
(2,531
)
 
(61,018
)
 
(54,401
)
 
(8,180
)
 
(7,614
)
Amortization of net prior service loss (gain)
 
22

 
(24
)
 
(448
)
 
(448
)
 
66

 
(73
)
 
(1,345
)
 
(1,345
)
Amortization of net actuarial loss (gain)
 
5,064

 
9,560

 
(2
)
 
398

 
15,240

 
28,878

 
(8
)
 
1,203

Net periodic benefit cost (credit)
 
15,099

 
21,686

 
(167
)
 
387

 
45,404

 
65,311

 
(500
)
 
1,150

Impact of PUC D&Os
 
(3,331
)
 
(9,257
)
 
494

 
(332
)
 
(9,993
)
 
(28,847
)
 
1,482

 
(1,018
)
Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,768

 
$
12,429

 
$
327

 
$
55

 
$
35,411

 
$
36,464

 
$
982

 
$
132

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
11,900

 
$
13,620

 
$
848

 
$
1,041

 
$
35,698

 
$
40,861

 
$
2,544

 
$
3,122

Interest cost
 
16,495

 
14,780

 
2,058

 
1,822

 
49,484

 
44,339

 
6,175

 
5,466

Expected return on plan assets
 
(18,167
)
 
(16,138
)
 
(2,684
)
 
(2,502
)
 
(54,496
)
 
(48,413
)
 
(8,054
)
 
(7,502
)
Amortization of net prior service loss (gain)
 
15

 
(116
)
 
(451
)
 
(451
)
 
46

 
(348
)
 
(1,353
)
 
(1,353
)
Amortization of net actuarial loss
 
4,616

 
8,649

 
—

 
387

 
13,845

 
25,948

 
—

 
1,159

Net periodic benefit cost (credit)
 
14,859

 
20,795

 
(229
)
 
297

 
44,577

 
62,387

 
(688
)
 
892

Impact of PUC D&Os
 
(3,331
)
 
(9,257
)
 
494

 
(332
)
 
(9,993
)
 
(28,847
)
 
1,482

 
(1,018
)
Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,528

 
$
11,538

 
$
265

 
$
(35
)
 
$
34,584

 
$
33,540

 
$
794

 
$
(126
)