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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of NPPC and NPBC for HEI consolidated and Hawaiian Electric consolidated were as follows:
 
 
Three months ended March 31
 
 
Pension benefits
 
Other benefits
(in thousands)
 
2018
 
2017
 
2018
 
2017
HEI consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
17,113

 
$
16,494

 
$
669

 
$
840

Interest cost
 
19,234

 
20,216

 
1,931

 
2,411

Expected return on plan assets
 
(27,254
)
 
(25,721
)
 
(3,192
)
 
(3,066
)
Amortization of net prior service gain
 
(10
)
 
(14
)
 
(452
)
 
(449
)
Amortization of net actuarial loss (gain)
 
7,395

 
6,513

 
(2
)
 
366

Net periodic pension/benefit cost (return)
 
16,478

 
17,488

 
(1,046
)
 
102

Impact of PUC D&Os
 
2,657

 
(5,156
)
 
1,071

 
146

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
19,135

 
$
12,332

 
$
25

 
$
248

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
16,673

 
$
16,094

 
$
664

 
$
835

Interest cost
 
17,710

 
18,589

 
1,859

 
2,327

Expected return on plan assets
 
(25,607
)
 
(24,011
)
 
(3,140
)
 
(3,017
)
Amortization of net prior service loss (gain)
 
2

 
2

 
(451
)
 
(451
)
Amortization of net actuarial loss
 
6,710

 
6,006

 
—

 
359

Net periodic pension/benefit cost (return)
 
15,488

 
16,680

 
(1,068
)
 
53

Impact of PUC D&Os
 
2,657

 
(5,156
)
 
1,071

 
146

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
18,145

 
$
11,524

 
$
3

 
$
199