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Electric utility subsidiary - Consolidating financial statements (Details 5) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities        
Net income $ 48,286 $ 48,707 $ 136,580 $ 123,920
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation of property, plant and equipment     129,574 120,355
Other amortization     5,454 2,352
Increase in deferred income taxes     48,900 60,580
Allowance for equity funds used during construction (1,937) (1,255) (4,933) (4,030)
Change in cash overdraft     (1,038) 0
Changes in assets and liabilities        
Decrease in fuel oil stock     15,784 24,332
Increase in regulatory assets     (17,531) (53,314)
Change in prepaid and accrued income and utility revenue taxes     (2,044) (19,212)
Decrease in defined benefit pension and other postretirement benefit plans liability     (2,594) (509)
Net cash provided by operating activities     173,410 246,726
Cash flows from investing activities        
Capital expenditures     (236,003) (247,392)
Contributions in aid of construction     21,740 23,633
Other     (39) 426
Net cash used in investing activities     (376,992) (363,424)
Cash flows from financing activities        
Common stock dividends     (94,674) (73,584)
Net increase in short-term borrowings with original maturities of three months or less     45,094 47,648
Other     (5,097) (4,033)
Net cash provided by financing activities     176,101 112,078
Net increase (decrease) in cash and cash equivalents     (27,481) (4,620)
Hawaiian Electric Company
        
Cash flows from operating activities        
Net income 39,149 38,087 109,339 91,749
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries     (28,651) (30,522)
Common stock dividends received from subsidiaries     19,557 21,379
Depreciation of property, plant and equipment     81,903 75,150
Other amortization     765 (228)
Increase in deferred income taxes     52,274 31,361
Change in tax credits, net     4,725 3,773
Allowance for equity funds used during construction (1,668) (914) (4,557) (3,144)
Changes in assets and liabilities        
Increase in accounts receivable     (17,540) 37,894
Decrease (increase) in accrued unbilled revenues     (554) (4,381)
Decrease in fuel oil stock     11,328 17,945
Increase in materials and supplies     875 (5,392)
Increase in regulatory assets     (15,159) (37,032)
Decrease in accounts payable     (70,916) (10,435)
Change in prepaid and accrued income and utility revenue taxes     (18,131) (7,122)
Decrease in defined benefit pension and other postretirement benefit plans liability     (422) 1,744
Change in other assets and liabilities     (31,754) (10,562)
Net cash provided by operating activities     93,082 172,177
Cash flows from investing activities        
Capital expenditures     (163,333) (164,423)
Contributions in aid of construction     12,352 15,699
Other       623
Advances from (to) affiliates     (4,961) (13,600)
Net cash used in investing activities     (155,942) (161,701)
Cash flows from financing activities        
Common stock dividends     (66,369) (61,183)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (810) (810)
Net increase in short-term borrowings with original maturities of three months or less     83,987 62,196
Other     (337) (38)
Net cash provided by financing activities     16,471 165
Net increase (decrease) in cash and cash equivalents     (46,389) 10,641
Cash and cash equivalents, beginning of period     61,245 8,265
Cash and cash equivalents, end of period 14,856 18,906 14,856 18,906
HELCO
        
Cash flows from operating activities        
Net income 3,434 5,577 13,708 15,144
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation of property, plant and equipment     26,926 25,641
Other amortization     1,950 1,075
Increase in deferred income taxes     5,146 7,165
Change in tax credits, net     687 119
Allowance for equity funds used during construction (142) (222) (328) (552)
Changes in assets and liabilities        
Increase in accounts receivable     (4,714) (2,552)
Decrease (increase) in accrued unbilled revenues     626 (1,727)
Decrease in fuel oil stock     219 870
Increase in materials and supplies     (987) (1,706)
Increase in regulatory assets     (2,594) (7,165)
Decrease in accounts payable     (1,807) (3,343)
Change in prepaid and accrued income and utility revenue taxes     (1,310) (3,566)
Decrease in defined benefit pension and other postretirement benefit plans liability     0 (191)
Change in other assets and liabilities     (3,886) (1,821)
Net cash provided by operating activities     33,636 27,391
Cash flows from investing activities        
Capital expenditures     (33,212) (35,900)
Contributions in aid of construction     6,229 6,160
Other       (196)
Advances from (to) affiliates     1,000 11,050
Net cash used in investing activities     (25,983) (18,886)
Cash flows from financing activities        
Common stock dividends     (8,720) (10,790)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (400) (400)
Net increase in short-term borrowings with original maturities of three months or less     1,000  
Other     (50) (2)
Net cash provided by financing activities     (8,170) (11,192)
Net increase (decrease) in cash and cash equivalents     (517) (2,687)
Cash and cash equivalents, beginning of period     1,326 5,441
Cash and cash equivalents, end of period 809 2,754 809 2,754
Maui Electric
        
Cash flows from operating activities        
Net income 6,594 5,446 15,554 15,990
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Depreciation of property, plant and equipment     15,961 15,074
Other amortization     1,947 1,623
Increase in deferred income taxes     9,972 9,488
Change in tax credits, net     404 618
Allowance for equity funds used during construction (127) (119) (48) (334)
Change in cash overdraft     (1,038)  
Changes in assets and liabilities        
Increase in accounts receivable     (442) 3,999
Decrease (increase) in accrued unbilled revenues     899 505
Decrease in fuel oil stock     4,237 5,517
Increase in materials and supplies     (1,483) (1,251)
Increase in regulatory assets     222 (9,117)
Decrease in accounts payable     (5,170) (9,196)
Change in prepaid and accrued income and utility revenue taxes     1,366 (4,728)
Decrease in defined benefit pension and other postretirement benefit plans liability     (326) (65)
Change in other assets and liabilities     (3,024) 4,924
Net cash provided by operating activities     39,031 33,047
Cash flows from investing activities        
Capital expenditures     (32,560) (37,546)
Contributions in aid of construction     3,159 1,774
Advances from (to) affiliates     0  
Net cash used in investing activities     (29,401) (35,772)
Cash flows from financing activities        
Common stock dividends     (10,762) (10,513)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (286) (286)
Net increase in short-term borrowings with original maturities of three months or less     3,961 13,600
Other     (75) (2)
Net cash provided by financing activities     (7,162) 2,799
Net increase (decrease) in cash and cash equivalents     2,468 74
Cash and cash equivalents, beginning of period     153 3,349
Cash and cash equivalents, end of period 2,621 3,423 2,621 3,423
Other subsidiaries
        
Cash flows from operating activities        
Net income 0 (1) 0 (2)
Changes in assets and liabilities        
Net cash provided by operating activities     0 (2)
Cash flows from investing activities        
Capital expenditures     0  
Contributions in aid of construction     0  
Advances from (to) affiliates     0  
Net cash used in investing activities     0  
Cash flows from financing activities        
Net increase (decrease) in cash and cash equivalents     0 (2)
Cash and cash equivalents, beginning of period     101 104
Cash and cash equivalents, end of period 101 102 101 102
Consolidating adjustments
        
Cash flows from operating activities        
Net income (9,800) (10,794) (28,576) (30,446)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries     28,576 30,446
Common stock dividends received from subsidiaries     (19,482) (21,303)
Changes in assets and liabilities        
Increase in accounts receivable     2,965 2,736
Change in other assets and liabilities     (2,965) (2,736)
Net cash provided by operating activities     (19,482) (21,303)
Cash flows from investing activities        
Capital expenditures     0  
Contributions in aid of construction     0  
Advances from (to) affiliates     3,961 2,550
Net cash used in investing activities     3,961 2,550
Cash flows from financing activities        
Common stock dividends     19,482 21,303
Net increase in short-term borrowings with original maturities of three months or less     (3,961) (2,550)
Net cash provided by financing activities     15,521 18,753
Net increase (decrease) in cash and cash equivalents       0
Cash and cash equivalents, beginning of period       0
Cash and cash equivalents, end of period   0   0
HECO Consolidated
        
Cash flows from operating activities        
Net income 39,377 38,315 110,025 92,435
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries     (75) (76)
Common stock dividends received from subsidiaries     75 76
Depreciation of property, plant and equipment     124,790 115,865
Other amortization     4,662 2,470
Increase in deferred income taxes     67,392 48,014
Change in tax credits, net     5,816 4,510
Allowance for equity funds used during construction (1,937) (1,255) (4,933) (4,030)
Change in cash overdraft     (1,038) 0
Changes in assets and liabilities        
Increase in accounts receivable     (19,731) 42,077
Decrease (increase) in accrued unbilled revenues     971 (5,603)
Decrease in fuel oil stock     15,784 24,332
Increase in materials and supplies     (1,595) (8,349)
Increase in regulatory assets     (17,531) (53,314)
Decrease in accounts payable     (77,893) (22,974)
Change in prepaid and accrued income and utility revenue taxes     (18,075) (15,416)
Decrease in defined benefit pension and other postretirement benefit plans liability     (748) 1,488
Change in other assets and liabilities     (41,629) (10,195)
Net cash provided by operating activities     146,267 211,310
Cash flows from investing activities        
Capital expenditures     (229,105) (237,869)
Contributions in aid of construction     21,740 23,633
Other     0 427
Advances from (to) affiliates       0
Net cash used in investing activities     (207,365) (213,809)
Cash flows from financing activities        
Common stock dividends     (66,369) (61,183)
Preferred stock dividends of Hawaiian Electric and subsidiaries     (1,496) (1,496)
Net increase in short-term borrowings with original maturities of three months or less     84,987 73,246
Other     (462) (42)
Net cash provided by financing activities     16,660 10,525
Net increase (decrease) in cash and cash equivalents     (44,438) 8,026
Cash and cash equivalents, beginning of period     62,825 17,159
Cash and cash equivalents, end of period $ 18,387 $ 25,185 $ 18,387 $ 25,185