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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2017
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)
 
2017
 
2016
 
2017
 
2016
HEI consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
16,494

 
$
15,391

 
$
840

 
$
836

Interest cost
 
20,216

 
20,277

 
2,411

 
2,474

Expected return on plan assets
 
(25,721
)
 
(24,664
)
 
(3,066
)
 
(3,052
)
Amortization of net prior service loss (gain)
 
(14
)
 
(14
)
 
(449
)
 
(448
)
Amortization of net actuarial loss
 
6,513

 
5,969

 
366

 
287

Net periodic benefit cost
 
17,488

 
16,959

 
102

 
97

Impact of PUC D&Os
 
(5,156
)
 
(4,046
)
 
146

 
189

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,332

 
$
12,913

 
$
248

 
$
286

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
16,094

 
$
14,933

 
$
835

 
$
822

Interest cost
 
18,589

 
18,603

 
2,327

 
2,389

Expected return on plan assets
 
(24,011
)
 
(22,932
)
 
(3,017
)
 
(3,003
)
Amortization of net prior service loss (gain)
 
2

 
4

 
(451
)
 
(451
)
Amortization of net actuarial loss
 
6,006

 
5,461

 
359

 
284

Net periodic benefit cost
 
16,680

 
16,069

 
53

 
41

Impact of PUC D&Os
 
(5,156
)
 
(4,046
)
 
146

 
189

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,524

 
$
12,023

 
$
199

 
$
230