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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details 3) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 39,486,000 | $ 48,707,000 | $ 41,061,000 | $ 34,152,000 | $ 14,309,000 | $ 48,177,000 | $ 39,273,000 | $ 38,789,000 | $ 163,406,000 | $ 140,548,000 | $ 140,120,000
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 160,061,000 | 150,389,000 | 148,152,000
Increase in deferred income taxes |  |  |  |  |  |  |  |  | 80,399,000 | 90,848,000 | 79,444,000
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | (430,000) | (61,000) | 0
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease in accounts, interest and dividends payable |  |  |  |  |  |  |  |  | (23,153,000) | (39,738,000) | (34,480,000)
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | (33,014,000) | (228,000) | (6,922,000)
Change in other assets and liabilities |  |  |  |  |  |  |  |  | (2,779,000) | (94,734,000) | (53,966,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 327,146,000 | 234,542,000 | 250,366,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (353,879,000) | (325,480,000) | (235,116,000)
Other |  |  |  |  |  |  |  |  | 3,516,000 | 2,677,000 | (2,974,000)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (563,760,000) | (427,047,000) | (326,787,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Net increase in short-term borrowings with original maturities of three months or less |  |  |  |  |  |  |  |  | 21,789,000 | 14,872,000 | 43,898,000
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 286,000,000 | 457,000,000 | 125,000,000
Repayment of long-term debt |  |  |  |  |  |  |  |  | (216,000,000) | (375,500,000) | (150,000,000)
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 430,000 | 61,000 | 0
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 55,086,000 | 23,613,000 | 15,979,000
Common stock dividends |  |  |  |  |  |  |  |  | (98,383,000) | (96,202,000) | (106,812,000)
Other |  |  |  |  |  |  |  |  | (1,187,000) | (2,645,000) | (710,000)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 236,988,000 | 141,902,000 | 16,035,000
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 374,000 | (50,603,000) | (60,386,000)
Cash and cash equivalents, January 1 |  |  |  | 219,662,000 |  |  |  | 270,265,000 | 219,662,000 | 270,265,000 | 330,651,000
Cash and cash equivalents, December 31 | 220,036,000 |  |  |  | 219,662,000 |  |  |  | 220,036,000 | 219,662,000 | 270,265,000
Issuance of common stock: Dividend reinvestment and stock purchase plan |  |  |  |  |  |  |  |  | 41,692,000 | 41,295,000 | 21,217,000
Common stock |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan |  |  |  |  |  |  |  |  | 41,692,000 | 41,295,000 | 21,217,000
Hawaiian Electric Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 161,516,000 | 138,658,000 | 138,230,000
Adjustments to reconcile net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Equity in net income |  |  |  |  |  |  |  |  | (180,359,000) | (157,883,000) | (158,722,000)
Common stock dividends/distributions received from subsidiaries |  |  |  |  |  |  |  |  | 121,578,000 | 118,044,000 | 128,558,000
Depreciation of property, plant and equipment |  |  |  |  |  |  |  |  | 596,000 | 672,000 | 227,000
Other amortization |  |  |  |  |  |  |  |  | 800,000 | 845,000 | 981,000
Increase in deferred income taxes |  |  |  |  |  |  |  |  | 15,228,000 | 150,000 | 276,000
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | (430,000) | (61,000) | 0
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Decrease (increase) in accounts receivable |  |  |  |  |  |  |  |  | (2,167,000) | (475,000) | 412,000
Decrease in accounts, interest and dividends payable |  |  |  |  |  |  |  |  | (23,420,000) | 19,995,000 | 1,324,000
Changes in prepaid and accrued income taxes |  |  |  |  |  |  |  |  | (15,604,000) | (4,861,000) | 3,550,000
Increase (decrease) in defined benefit pension and other postretirement benefit plans liability |  |  |  |  |  |  |  |  | (6,449,000) | 1,805,000 | 5,313,000
Change in other assets and liabilities |  |  |  |  |  |  |  |  | 10,985,000 | 10,229,000 | (1,880,000)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 82,274,000 | 127,118,000 | 118,269,000
Cash flows from investing activities |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (201,000) | (410,000) | (110,000)
Investments in subsidiaries |  |  |  |  |  |  |  |  | (78,500,000) | (44,000,000) | (40,000,000)
Other |  |  |  |  |  |  |  |  | 0 | 0 | (4,206,000)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (78,701,000) | (44,410,000) | (44,316,000)
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Net decrease in notes payable to subsidiaries with original maturities of three months or less |  |  |  |  |  |  |  |  | 56,000 | (1,797,000) | (1,757,000)
Net increase in short-term borrowings with original maturities of three months or less |  |  |  |  |  |  |  |  | 21,788,000 | 14,873,000 | 43,897,000
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 50,000,000 | 0 | 125,000,000
Repayment of long-term debt |  |  |  |  |  |  |  |  | (50,000,000) | (7,000,000) | (150,000,000)
Excess tax benefits from share-based payment arrangements |  |  |  |  |  |  |  |  | 430,000 | 61,000 | 0
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 55,086,000 | 23,613,000 | 15,979,000
Common stock dividends |  |  |  |  |  |  |  |  | (98,383,000) | (96,202,000) | (106,812,000)
Other |  |  |  |  |  |  |  |  | 0 | 0 | (35,000)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (21,023,000) | (66,452,000) | (73,728,000)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (17,450,000) | 16,256,000 | 225,000
Cash and cash equivalents, January 1 |  |  |  | 18,021,000 |  |  |  | 1,765,000 | 18,021,000 | 1,765,000 | 1,540,000
Cash and cash equivalents, December 31 | 571,000 |  |  |  | 18,021,000 |  |  |  | 571,000 | 18,021,000 | 1,765,000
Hawaiian Electric Industries, Inc. | ASHI | Consolidated subsidiary |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Accounts receivable reduction |  |  |  |  |  |  |  |  | 2,300,000 | 1,800,000 | 1,300,000
HEI notes payable increase to ASHI |  |  |  |  |  |  |  |  | 2,500,000 | 2,500,000 | 2,000,000
Hawaiian Electric Industries, Inc. | Common stock |  |  |  |  |  |  |  |  |  |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock: Dividend reinvestment and stock purchase plan |  |  |  |  |  |  |  |  | $ 24,000,000 | $ 24,000,000 | $ 12,000,000

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