XML 62 R44.htm IDEA: XBRL DOCUMENT v3.4.0.3
Electric utility segment - Unconsolidated variable interest entities (Details)
 1 Months Ended 3 Months Ended
Nov. 30, 2015
MW
Oct. 31, 2015
MW
Oct. 31, 2004
MW
Mar. 31, 2004
USD ($)
security
Oct. 31, 1988
MW
Mar. 31, 1988
MW
Mar. 31, 2016
USD ($)
agreement
entity
MW
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Power purchase agreement                  
Purchases from IPPs             $ 116,000,000 $ 136,000,000  
Termination period             60 days    
Accounts payable             $ 119,288,000   $ 138,523,000
Hawaiian Electric Company                  
Power purchase agreement                  
Number of power purchase agreements (PPAs) | agreement             5    
Maximum capacity of small power production facilities (in kilowatts) | MW             0.1    
Number of entities currently not required to be consolidated as VIEs | entity             0    
Purchases from IPPs             $ 91,917,000 103,250,000  
Number of firm capacity producers declining to provide financial information to determine primary beneficiary status | entity             2    
Minimum potential number of IPP entities consolidated into company in the future | entity             1    
Hawaiian Electric Company | AES Hawaii, Inc. (AES Hawaii)                  
Power purchase agreement                  
Purchases from IPPs             $ 38,000,000 34,000,000  
Power purchase capacity that Increases from initial capacity (in megawatts) | MW 189         180      
Number of years entity entered under power purchase agreement           30 years      
Accounts payable             13,000,000    
Hawaiian Electric Company | Kalaeloa Partners, L.P. (Kalaeloa)                  
Power purchase agreement                  
Purchases from IPPs             29,000,000 44,000,000  
Power purchase capacity that Increases from initial capacity (in megawatts) | MW         180        
Number of years entity entered under power purchase agreement         25 years        
Power purchase capacity that Increases from initial capacity (in megawatts) | MW     208            
Accounts payable             8,000,000    
Hawaiian Electric Company | Hamakua Energy Partners, L.P. (HEP)                  
Power purchase agreement                  
Purchases from IPPs             11,000,000 11,000,000  
Hawaiian Electric Company | HPOWER                  
Power purchase agreement                  
Purchases from IPPs             16,000,000 16,000,000  
Hawaiian Electric Company | Puna Geothermal Venture                  
Power purchase agreement                  
Purchases from IPPs             7,000,000 7,000,000  
Hawaiian Electric Company | Hawaiian Commercial & Sugar (HC&S)                  
Power purchase agreement                  
Purchases from IPPs             0 2,000,000  
Hawaiian Electric Company | Other IPPs                  
Power purchase agreement                  
Purchases from IPPs             15,000,000 22,000,000  
Hawaii Electric Light Company, Inc. (HELCO)                  
Power purchase agreement                  
Purchases from IPPs             16,797,000 21,893,000  
Maui Electric                  
Power purchase agreement                  
Purchases from IPPs             7,145,000 10,864,000  
Maximum scheduled energy during certain month (in megawatts) | MW   4              
Maximum potential emergency power | MW   16              
HECO Capital Trust III                  
Unconsolidated variable interest entities                  
Investment in 2004 Debentures             51,500,000   51,500,000
Interest income             $ 800,000 800,000  
HECO Capital Trust III | Hawaiian Electric Company                  
Unconsolidated variable interest entities                  
Principal amount of 2004 Debentures       $ 31,500,000          
Percent of ownership in Trust III             100.00%    
HECO Capital Trust III | Hawaiian Electric Company | 2004 Trust Preferred Securities                  
Unconsolidated variable interest entities                  
Number of 2004 Trust Preferred Securities issued | security       2,000,000          
Dividend rate on 2004 Trust Preferred Securities (as a percent)       6.50%          
Aggregate Liquidation preference       $ 50,000,000          
Balance of Trust Securities             $ 50,000,000   50,000,000
Dividend distributions on Trust Preferred Securities             800,000 800,000  
HECO Capital Trust III | Hawaiian Electric Company | Trust Common Securities                  
Unconsolidated variable interest entities                  
Aggregate Liquidation preference       1,500,000          
Balance of Trust Securities             1,500,000   $ 1,500,000
Common dividend             $ 25,000 $ 25,000  
HECO Capital Trust III | Hawaii Electric Light Company, Inc. (HELCO)                  
Unconsolidated variable interest entities                  
Principal amount of 2004 Debentures       10,000,000          
HECO Capital Trust III | Maui Electric                  
Unconsolidated variable interest entities                  
Principal amount of 2004 Debentures       $ 10,000,000