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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [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)
 
2019
 
2018
 
2019
 
2018
HEI consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
15,382

 
$
17,113

 
$
541

 
$
669

Interest cost
 
21,033

 
19,234

 
1,997

 
1,931

Expected return on plan assets
 
(27,998
)
 
(27,254
)
 
(3,086
)
 
(3,192
)
Amortization of net prior service gain
 
(11
)
 
(10
)
 
(452
)
 
(452
)
Amortization of net actuarial (gains) losses
 
3,839

 
7,395

 
(3
)
 
(2
)
Net periodic pension/benefit cost (return)
 
12,245

 
16,478

 
(1,003
)
 
(1,046
)
Impact of PUC D&Os
 
12,279

 
2,657

 
811

 
1,071

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,524

 
$
19,135

 
$
(192
)
 
$
25

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
15,001

 
$
16,673

 
$
537

 
$
664

Interest cost
 
19,414

 
17,710

 
1,917

 
1,859

Expected return on plan assets
 
(26,164
)
 
(25,607
)
 
(3,035
)
 
(3,140
)
Amortization of net prior service (gain) cost
 
2

 
2

 
(451
)
 
(451
)
Amortization of net actuarial loss
 
3,576

 
6,710

 
—

 
—

Net periodic pension/benefit cost (return)
 
11,829

 
15,488

 
(1,032
)
 
(1,068
)
Impact of PUC D&Os
 
12,279

 
2,657

 
811

 
1,071

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,108

 
$
18,145

 
$
(221
)
 
$
3