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Retirement benefits (Tables)
 3 Months Ended
Mar. 31, 2015
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)
 
2015
 
2014
 
2015
 
2014
HEI consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
16,466

 
$
12,127

 
$
869

 
$
883

Interest cost
 
19,139

 
18,001

 
2,235

 
2,160

Expected return on plan assets
 
(22,151
)
 
(20,347
)
 
(2,907
)
 
(2,708
)
Amortization of net prior service loss (gain)
 
1

 
22

 
(448
)
 
(448
)
Amortization of net actuarial loss (gain)
 
8,962

 
5,038

 
430

 
(3
)
Net periodic benefit cost (credit)
 
22,417

 
14,841

 
179

 
(116
)
Impact of PUC D&Os
 
(9,513
)
 
(3,011
)
 
98

 
445

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
12,904

 
$
11,830

 
$
277

 
$
329

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
Service cost
 
$
15,983

 
$
11,697

 
$
855

 
$
856

Interest cost
 
17,516

 
16,436

 
2,159

 
2,079

Expected return on plan assets
 
(20,632
)
 
(18,171
)
 
(2,859
)
 
(2,663
)
Amortization of net prior service loss (gain)
 
10

 
15

 
(451
)
 
(451
)
Amortization of net actuarial loss
 
8,094

 
4,560

 
422

 
—

Net periodic benefit cost (credit)
 
20,971

 
14,537

 
126

 
(179
)
Impact of PUC D&Os
 
(9,513
)
 
(3,011
)
 
98

 
445

Net periodic benefit cost (adjusted for impact of PUC D&Os)
 
$
11,458

 
$
11,526

 
$
224

 
$
266