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Consolidated Statements of Capitalization - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Common stock equity
Retained earnings	$ 324,766,000	$ 296,654,000
Accumulated other comprehensive income (loss), net of taxes - retirement benefit plans	(24,336,000)	(27,551,000)
Total shareholders' equity	1,927,640,000	1,790,573,000
Preferred stock of subsidiaries - not subject to mandatory redemption	34,293,000	34,293,000
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock equity
Common stock of $6 2/3 par value, Authorized: 50,000,000 shares. Outstanding: 2015, 15,805,327 shares and 2014, 15,805,327 shares	105,388,000	105,388,000
Additional paid in capital	578,930,000	578,938,000
Retained earnings	1,043,082,000	997,773,000
Accumulated other comprehensive income (loss), net of taxes - retirement benefit plans	925,000	45,000
Total shareholders' equity	$ 1,728,325,000	$ 1,682,144,000
Shares outstanding December 31, 2013	1,234,657	1,234,657
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 34,293,000	$ 34,293,000
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	462,000,000	462,000,000
Other long-term debt – unsecured:
Other long-term debt - unsecured	824,546,000	744,546,000
Total long-term debt	1,286,546,000	1,206,546,000
Less unamortized discount	0	0
Current portion of long-term debt	0	0
Long-term debt, net	1,286,546,000	1,206,546,000
Total capitalization	$ 3,049,164,000	$ 2,922,983,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series C, 4.25% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	150,000	150,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,000,000	$ 3,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series D, 5.00% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	50,000	50,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 1,000,000	$ 1,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series E, 5.00% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	150,000	150,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,000,000	$ 3,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series H, 5.25% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	250,000	250,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series I, 5.00% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	89,657	89,657
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 1,793,000	$ 1,793,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series J, 4.75% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	250,000	250,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Hawaiian Electric Company, Inc. and Subsidiaries | Series K, 4.65% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 20	$ 20
Shares outstanding December 31, 2013	175,000	175,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 3,500,000	$ 3,500,000
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes
Other long-term debt – unsecured:
Other long-term debt - unsecured	773,000,000	693,000,000
Hawaiian Electric Company, Inc (HECO)
Common stock equity
Total shareholders' equity	1,728,325,000	1,682,144,000
Other long-term debt – unsecured:
Long-term debt, net	880,546,000	830,546,000
Total capitalization	$ 2,631,164,000	$ 2,534,983,000
Hawaiian Electric Company, Inc (HECO) | 3.25% Refunding Series 2015 SPRBs due 2025
Debt instrument, stated interest rate (as a percent)	3.25%	3.25%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 40,000,000	$ 0
Hawaiian Electric Company, Inc (HECO) | 6.50%, series 2009, due 2039
Debt instrument, stated interest rate (as a percent)	6.50%	6.50%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 90,000,000	$ 90,000,000
Hawaiian Electric Company, Inc (HECO) | 4.60%, refunding series 2007B, due 2026
Debt instrument, stated interest rate (as a percent)	4.60%	4.60%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 62,000,000	$ 62,000,000
Hawaiian Electric Company, Inc (HECO) | 4.65%, series 2007A, due 2037
Debt instrument, stated interest rate (as a percent)	4.65%	4.65%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 100,000,000	$ 100,000,000
Hawaiian Electric Company, Inc (HECO) | 4.80%, refunding series 2005A, due 2025
Debt instrument, stated interest rate (as a percent)	4.80%	4.80%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 0	$ 40,000,000
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 5.23%, Series 2015A, due 2045
Debt instrument, stated interest rate (as a percent)	5.23%	5.23%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 50,000,000	$ 0
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 4.45%, Series 2013A, due 2022
Debt instrument, stated interest rate (as a percent)	4.45%	4.45%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 40,000,000	$ 40,000,000
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 4.84%, Series 2013B, due 2027
Debt instrument, stated interest rate (as a percent)	4.84%	4.84%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 50,000,000	$ 50,000,000
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 5.65%, Series 2013C, due 2043
Debt instrument, stated interest rate (as a percent)	5.65%	5.65%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 50,000,000	$ 50,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 3.79%, Series 2012A, due 2018
Debt instrument, stated interest rate (as a percent)	3.79%	3.79%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 30,000,000	$ 30,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 4.03%, Series 2012B, due 2020
Debt instrument, stated interest rate (as a percent)	4.03%	4.03%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 62,000,000	$ 62,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 4.55%, due 2023
Debt instrument, stated interest rate (as a percent)	4.55%	4.55%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 50,000,000	$ 50,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 4.72%, Series 2012D, due 2029
Debt instrument, stated interest rate (as a percent)	4.72%	4.72%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 35,000,000	$ 35,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 5.39%, Series, 2012E, due 2042
Debt instrument, stated interest rate (as a percent)	5.39%	5.39%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 150,000,000	$ 150,000,000
Hawaiian Electric Company, Inc (HECO) | Senior notes 4.53%, Series, 2012F, due 2032
Debt instrument, stated interest rate (as a percent)	4.53%	4.53%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 40,000,000	$ 40,000,000
Hawaiian Electric Company, Inc (HECO) | 6.50% Junior subordinated deferrable interest debentures, series 2004, due 2034
Debt instrument, stated interest rate (as a percent)	6.50%	6.50%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 51,546,000	$ 51,546,000
Hawaii Electric Light Company, Inc. (HELCO)
Common stock equity
Total shareholders' equity	292,702,000	281,846,000
Other long-term debt – unsecured:
Long-term debt, net	215,000,000	190,000,000
Total capitalization	$ 514,702,000	$ 478,846,000
Hawaii Electric Light Company, Inc. (HELCO) | Series G, 7.625% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 100	$ 100
Shares outstanding December 31, 2013	70,000	70,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 7,000,000	$ 7,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 3.25% Refunding Series 2015 SPRBs due 2025
Debt instrument, stated interest rate (as a percent)	3.25%	3.25%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 5,000,000	$ 0
Hawaii Electric Light Company, Inc. (HELCO) | 6.50%, series 2009, due 2039
Debt instrument, stated interest rate (as a percent)	6.50%	6.50%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 60,000,000	$ 60,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 4.60%, refunding series 2007B, due 2026
Debt instrument, stated interest rate (as a percent)	4.60%	4.60%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 8,000,000	$ 8,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 4.65%, series 2007A, due 2037
Debt instrument, stated interest rate (as a percent)	4.65%	4.65%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 20,000,000	$ 20,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 4.80%, refunding series 2005A, due 2025
Debt instrument, stated interest rate (as a percent)	4.80%	4.80%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 0	$ 5,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 5.50%, refunding series 1999A, due 2014
Debt instrument, stated interest rate (as a percent)		5.50%
Hawaii Electric Light Company, Inc. (HELCO) | Hawaii Electric Light, 5.23%, Series 2015A, due 2045
Debt instrument, stated interest rate (as a percent)	5.23%	5.23%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 25,000,000	$ 0
Hawaii Electric Light Company, Inc. (HELCO) | Hawaii Electric Light, 3.83%, Series 2013A, due 2020
Debt instrument, stated interest rate (as a percent)	3.83%	3.83%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 14,000,000	$ 14,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Hawaii Electric Light, 4.45%, Series 2013B, due 2022
Debt instrument, stated interest rate (as a percent)	4.45%	4.45%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 12,000,000	$ 12,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Hawaii Electric Light, 4.84%, Series 2013C, due 2027
Debt instrument, stated interest rate (as a percent)	4.84%	4.84%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 30,000,000	$ 30,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Senior notes 3.79%, Series 2012A, due 2018
Debt instrument, stated interest rate (as a percent)	3.79%	3.79%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 11,000,000	$ 11,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Senior notes 4.55%, due 2023
Debt instrument, stated interest rate (as a percent)	4.55%	4.55%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 20,000,000	$ 20,000,000
Maui Electric Company, Limited (MECO)
Common stock equity
Total shareholders' equity	263,725,000	256,692,000
Other long-term debt – unsecured:
Long-term debt, net	191,000,000	186,000,000
Total capitalization	$ 459,725,000	$ 447,692,000
Maui Electric Company, Limited (MECO) | Series H, 7.625% Preferred Stock
Common stock equity
Preferred Stock, Par Value (in dollars per share)	$ 100	$ 100
Shares outstanding December 31, 2013	50,000	50,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 5,000,000	$ 5,000,000
Maui Electric Company, Limited (MECO) | 3.25% Refunding Series 2015 SPRBs due 2025
Debt instrument, stated interest rate (as a percent)	3.25%	3.25%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 2,000,000	$ 0
Maui Electric Company, Limited (MECO) | 4.60%, refunding series 2007B, due 2026
Debt instrument, stated interest rate (as a percent)	4.60%	4.60%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 55,000,000	$ 55,000,000
Maui Electric Company, Limited (MECO) | 4.65%, series 2007A, due 2037
Debt instrument, stated interest rate (as a percent)	4.65%	4.65%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 20,000,000	$ 20,000,000
Maui Electric Company, Limited (MECO) | 4.80%, refunding series 2005A, due 2025
Debt instrument, stated interest rate (as a percent)	4.80%	4.80%
Obligations to the State of Hawaii for the repayment of Special Purpose Revenue Bonds (subsidiary obligations unconditionally guaranteed by Hawaiian Electric):
Secured long-term debt	$ 0	$ 2,000,000
Maui Electric Company, Limited (MECO) | Maui Electric, 5.23%, Series 2015A, due 2045
Debt instrument, stated interest rate (as a percent)	5.23%	5.23%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 5,000,000	$ 0
Maui Electric Company, Limited (MECO) | Maui Electric, 4.84%, Series 2013A, due 2027
Debt instrument, stated interest rate (as a percent)	4.84%	4.84%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 20,000,000	$ 20,000,000
Maui Electric Company, Limited (MECO) | Maui Electric, 5.65%, Series 2013B, due 2043
Debt instrument, stated interest rate (as a percent)	5.65%	5.65%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 20,000,000	$ 20,000,000
Maui Electric Company, Limited (MECO) | Senior notes 3.79%, Series 2012A, due 2018
Debt instrument, stated interest rate (as a percent)	3.79%	3.79%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 9,000,000	$ 9,000,000
Maui Electric Company, Limited (MECO) | Senior notes 4.03%, Series 2012B, due 2020
Debt instrument, stated interest rate (as a percent)	4.03%	4.03%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 20,000,000	$ 20,000,000
Maui Electric Company, Limited (MECO) | Senior notes 4.55%, due 2023
Debt instrument, stated interest rate (as a percent)	4.55%	4.55%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 30,000,000	$ 30,000,000

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