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Short-term borrowings (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Apr. 02, 2014 USD ($) Institution | Apr. 01, 2014 USD ($) | Dec. 31, 2013 USD ($)
Short-term borrowings |  |  |  |
Outstanding amount | $ 118,972,000 |  |  | $ 105,482,000
HEI |  |  |  |
Credit agreements |  |  |  |
Number of financial institutions | Institution |  | 9 |  |
Line of credit facility, reference rate | Adjusted LIBO Rate |  |  |
Actual capitalization ratio (as a percent) | 19.00% |  |  |
HEI | Maximum |  |  |  |
Credit agreements |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant (as a percent) |  | 50.00% |  |
Hawaiian Electric Company, Inc (HECO) |  |  |  |
Credit agreements |  |  |  |
Number of financial institutions | Institution |  | 9 |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 65.00% |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant (as a percent) | 35.00% |  |  |
Actual ratio of consolidated debt to total consolidated capitalization (as a percent) | 58.00% |  |  |
HELCO |  |  |  |
Credit agreements |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) | 41.00% |  |  |
MECO |  |  |  |
Credit agreements |  |  |  |
Actual ratio of consolidated subsidiary debt to total consolidated capitalization (as a percent) | 42.00% |  |  |
Commercial paper | HEI |  |  |  |
Short-term borrowings |  |  |  |
Outstanding amount | $ 119,000,000 |  |  | $ 105,000,000
Weighted-average interest rate (as a percent) | 0.70% |  |  | 0.70%
Line of credit facility | HEI |  |  |  |
Short-term borrowings |  |  |  |
Maximum capacity under syndicated credit facilities |  | $ 150,000,000 | $ 125,000,000 |
Credit agreements |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) | 0.20% |  |  |
Line of credit facility | Hawaiian Electric Company, Inc (HECO) |  |  |  |
Short-term borrowings |  |  |  |
Maximum capacity under syndicated credit facilities |  | $ 200,000,000 | $ 175,000,000 |
Credit agreements |  |  |  |
Annual fees on undrawn commitments, basis points (as a percent) | 0.175% |  |  |
Line of credit facility | Adjusted LIBO Rate | HEI |  |  |  |
Credit agreements |  |  |  |
Line of credit facility basis point spread (as a percent) | 1.375% |  |  |
Line of credit facility | Adjusted LIBO Rate | Hawaiian Electric Company, Inc (HECO) |  |  |  |
Credit agreements |  |  |  |
Line of credit facility basis point spread (as a percent) | 1.25% |  |  |

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