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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31
 
 
Pension benefits
 
Other benefits
(in thousands)
 
2016
 
2015
 
2016
 
2015
HEI consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
15,391

 
$
16,466

 
$
836

 
$
869

Interest cost
 
20,277

 
19,139

 
2,474

 
2,235

Expected return on plan assets
 
(24,664
)
 
(22,151
)
 
(3,052
)
 
(2,907
)
Amortization of net prior service loss (gain)
 
(14
)
 
1

 
(448
)
 
(448
)
Amortization of net actuarial loss
 
5,969

 
8,962

 
287

 
430

Net periodic benefit cost
 
16,959

 
22,417

 
97

 
179

Impact of PUC D&Os
 
(4,046
)
 
(9,513
)
 
189

 
98

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,913

 
$
12,904

 
$
286

 
$
277

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
14,933

 
$
15,983

 
$
822

 
$
855

Interest cost
 
18,603

 
17,516

 
2,389

 
2,159

Expected return on plan assets
 
(22,932
)
 
(20,632
)
 
(3,003
)
 
(2,859
)
Amortization of net prior service loss (gain)
 
4

 
10

 
(451
)
 
(451
)
Amortization of net actuarial loss
 
5,461

 
8,094

 
284

 
422

Net periodic benefit cost
 
16,069

 
20,971

 
41

 
126

Impact of PUC D&Os
 
(4,046
)
 
(9,513
)
 
189

 
98

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,023

 
$
11,458

 
$
230

 
$
224