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Long-term debt (Tables)
 12 Months Ended
Dec. 31, 2017
Long-term Debt, Unclassified [Abstract]  
Schedule of long-term debt
December 31
2017

 
2016

(dollars in thousands)
 

 
 

Long-term debt of Utilities, net of unamortized debt issuance costs 1
$
1,368,479

 
$
1,319,260

Hamakua Energy 4.02% notes, due 2030
67,325

 
—

HEI 2.99% term loan, due 2022
150,000

 
—

HEI 5.67% senior notes, due 2021
50,000

 
50,000

HEI 3.99% senior notes, due 2023
50,000

 
50,000

HEI term loans LIBOR + 0.75%, paid 2017
—

 
200,000

Less unamortized debt issuance costs
(2,007
)
 
(241
)
 
$
1,683,797

 
$
1,619,019

1
See components of “Total long-term debt” and unamortized debt issuance costs in Hawaiian Electric and subsidiaries’ Consolidated Statements of Capitalization.
On June 29, 2017, the DBF for the benefit of the Utilities, issued, at par:
 
Refunding Series 2017A Special Purpose Revenue Bonds
Refunding Series 2017B Special Purpose Revenue Bonds
Aggregate principal amount
$125 million
$140 million
Fixed coupon interest rate
3.10%
4.00%
Maturity date
May 1, 2026
March 1, 2037
DBF loaned the proceeds to:
 
 
Hawaiian Electric
$62 million
$100 million
Hawaii Electric Light
$8 million
$20 million
Maui Electric
$55 million
$20 million

Proceeds from the sale were applied to redeem at par bonds previously issued by the DBF for the benefit of the Utilities:
 
Refunding Series 2007B Special Purpose Revenue Bonds
Series 2007A Special Purpose Revenue Bonds
Aggregate principal amount
$125 million
$140 million
Fixed coupon interest rate
4.60%
4.65%
Maturity date
May 1, 2026
March 1, 2037