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Consolidated Statements of Capitalization - HECO - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Common stock equity
Retained earnings	$ 438,972,000	$ 324,766,000
Accumulated other comprehensive income, net of taxes - Retirement benefit plans	24,744,000	24,336,000
Accumulated other comprehensive loss, net of tax benefits	(33,129,000)	(26,262,000)
Total shareholders’ equity	2,066,753,000	1,927,640,000
Preferred stock of subsidiaries - not subject to mandatory redemption	$ 34,293,000	$ 34,293,000
6.50 %, series 2004, Junior subordinated deferrable interest debentures, due 2034
Common stock equity
Debt instrument, stated interest rate (as a percent)	6.50%	6.50%
Hawaiian Electric Company, Inc (HECO)
Common stock equity
Total shareholders’ equity	$ 1,799,787,000	$ 1,728,325,000
Other long-term debt – unsecured:
Long-term debt, net	915,437,000	875,163,000
Total capitalization	$ 2,737,517,000	$ 2,625,781,000
Hawaiian Electric Company, Inc (HECO) | 3.25% Refunding Series 2015 SPRBs due 2025
Common stock equity
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	$ 40,000,000
Hawaiian Electric Company, Inc (HECO) | 6.50%, series 2009, due 2039
Common stock equity
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
Common stock equity
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
Common stock equity
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) | Hawaiian Electric, 4.54%, Series 2016A, due 2046
Common stock equity
Debt instrument, stated interest rate (as a percent)	4.54%	4.54%
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 40,000,000	$ 0
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 5.23%, Series 2015A, due 2045
Common stock equity
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	$ 50,000,000
Hawaiian Electric Company, Inc (HECO) | Hawaiian Electric, 4.45%, Series 2013A, due 2022
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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) | Hawaiian Electric, 4.72%, Series 2012D, due 2029
Common stock equity
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) | Hawaiian Electric, 5.39%, Series 2012E, due 2042
Common stock equity
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) | Hawaiian Electric, 4.53%, Series 2012F, due 2032
Common stock equity
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 %, series 2004, Junior subordinated deferrable interest debentures, due 2034
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	291,291,000	292,702,000
Other long-term debt – unsecured:
Long-term debt, net	213,703,000	213,580,000
Total capitalization	$ 511,994,000	$ 513,282,000
Hawaii Electric Light Company, Inc. (HELCO) | 3.25% Refunding Series 2015 SPRBs due 2025
Common stock equity
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	$ 5,000,000
Hawaii Electric Light Company, Inc. (HELCO) | 6.50%, series 2009, due 2039
Common stock equity
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
Common stock equity
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
Common stock equity
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) | Hawaii Electric Light, 5.23%, Series 2015A, due 2045
Common stock equity
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	$ 25,000,000
Hawaii Electric Light Company, Inc. (HELCO) | Hawaii Electric Light, 3.83%, Series 2013A, due 2020
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
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
Maui Electric Company, Limited (MECO)
Common stock equity
Total shareholders’ equity	259,554,000	263,725,000
Other long-term debt – unsecured:
Long-term debt, net	190,120,000	189,959,000
Total capitalization	$ 454,674,000	$ 458,684,000
Maui Electric Company, Limited (MECO) | 3.25% Refunding Series 2015 SPRBs due 2025
Common stock equity
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	$ 2,000,000
Maui Electric Company, Limited (MECO) | 4.60%, refunding series 2007B, due 2026
Common stock equity
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
Common stock equity
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) | Maui Electric, 5.23%, Series 2015A, due 2045
Common stock equity
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	$ 5,000,000
Maui Electric Company, Limited (MECO) | Maui Electric, 4.84%, Series 2013A, due 2027
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
Common stock equity
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
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
Hawaiian Electric Company, Inc. and Subsidiaries
Common stock equity
Common stock of $6 2/3 par value, Authorized: 50,000,000 shares. Outstanding: 16,019,785 shares and 15,805327 shares at December 31, 2016 and 2015, respectively	106,818,000	105,388,000
Premium on capital stock	601,491,000	578,930,000
Retained earnings	1,091,800,000	1,043,082,000
Accumulated other comprehensive income, net of taxes - Unrealized losses on derivatives	(454,000)	0
Accumulated other comprehensive income, net of taxes - Retirement benefit plans	(132,000)	(925,000)
Accumulated other comprehensive loss, net of tax benefits	(322,000)	925,000
Total shareholders’ equity	$ 1,799,787,000	$ 1,728,325,000
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	864,546,000	824,546,000
Total long-term debt	1,326,546,000	1,286,546,000
Less unamortized discount	7,286,000	7,844,000
Long-term debt, net	1,319,260,000	1,278,702,000
Total capitalization	3,153,340,000	3,041,320,000
Hawaiian Electric Company, Inc. and Subsidiaries | Senior notes
Other long-term debt – unsecured:
Other long-term debt - unsecured	$ 813,000,000	$ 773,000,000
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

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