XML 102 R68.htm IDEA: XBRL DOCUMENT v3.8.0.1
Electric utility segment - Consolidating Statements of Changes in Common Stock Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (decrease) in stockholders' equity                      
Beginning Balance       $ 2,066,753       $ 1,927,640 $ 2,066,753 $ 1,927,640 $ 1,790,573
Net income for common stock $ 32,370 $ 60,073 $ 38,661 34,193 $ 44,634 $ 127,142 $ 44,128 32,352 165,297 248,256 159,877
Other comprehensive income (loss), net of tax benefits                 (1,372) (6,867) 1,116
Issuance of common stock, net of expenses                   26,844  
Common stock dividends                 (134,873) (134,050) (131,765)
Ending Balance 2,097,386       2,066,753       2,097,386 2,066,753 1,927,640
Hawaiian Electric Company, Inc (HECO)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       1,799,787       1,728,325 1,799,787 1,728,325 1,682,144
Net income for common stock                 119,951 142,317 135,714
Other comprehensive income (loss), net of tax benefits                 (688) (1,247) 880
Issuance of common stock, net of expenses                 14,000 23,991 (8)
Common stock dividends                 (87,767) (93,599) (90,405)
Ending Balance 1,845,283       1,799,787       1,845,283 1,799,787 1,728,325
Hawaii Electric Light Company, Inc. (HELCO)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       291,291       292,702 291,291 292,702 281,846
Net income for common stock                 20,146 21,255 20,755
Other comprehensive income (loss), net of tax benefits                 2 (154) 122
Issuance of common stock, net of expenses                 4 (5) 0
Common stock dividends                 (24,796) (22,507) (10,021)
Ending Balance 286,647       291,291       286,647 291,291 292,702
Maui Electric Company, Limited (MECO)                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       259,554       263,725 259,554 263,725 256,692
Net income for common stock                 17,911 21,136 22,165
Other comprehensive income (loss), net of tax benefits                 (55) (46) 44
Issuance of common stock, net of expenses                 4,801 0 (1)
Common stock dividends                 (11,946) (25,261) (15,175)
Ending Balance 270,265       259,554       270,265 259,554 263,725
Other subsidiaries                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       101       101 101 101 101
Net income for common stock                 0 0 0
Other comprehensive income (loss), net of tax benefits                 0 0 0
Issuance of common stock, net of expenses                 0 0 0
Common stock dividends                 0 0 0
Ending Balance 101       101       101 101 101
Consolidating adjustments                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       (550,946)       (556,528) (550,946) (556,528) (538,639)
Net income for common stock                 (38,057) (42,391) (42,920)
Other comprehensive income (loss), net of tax benefits                 53 200 (166)
Issuance of common stock, net of expenses                 (4,805) 5 1
Common stock dividends                 36,742 47,768 25,196
Ending Balance (557,013)       (550,946)       (557,013) (550,946) (556,528)
HECO Consolidated                      
Increase (decrease) in stockholders' equity                      
Beginning Balance       1,799,787       1,728,325 1,799,787 1,728,325 1,682,144
Net income for common stock 25,355 $ 47,487 $ 25,644 $ 21,465 34,119 $ 46,974 $ 35,857 $ 25,367 119,951 142,317 135,714
Other comprehensive income (loss), net of tax benefits                 (688) (1,247) 880
Issuance of common stock, net of expenses                 14,000 23,991 (8)
Common stock dividends                 (87,767) (93,599) (90,405)
Ending Balance $ 1,845,283       $ 1,799,787       $ 1,845,283 $ 1,799,787 $ 1,728,325