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Short-term borrowings (Details) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
May 14, 2021 USD ($) extensionOption institution | Jan. 29, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 29, 2020 USD ($) | May 19, 2020 USD ($) | Apr. 20, 2020 USD ($) | Dec. 31, 2021 USD ($) instrument | Dec. 31, 2020 USD ($) instrument
Short-term borrowings |  |  |  |  |  |  |  |
Outstanding amount |  |  | $ 129,379,000 |  |  |  | $ 53,998,000 | $ 129,379,000
Letter of Credit | Hamakua Energy |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Number of letters of credit entered into during the period | instrument |  |  |  |  |  |  | 5 | 3
Letters of credit outstanding |  |  | 6,000,000 |  |  |  | $ 10,000,000 | $ 6,000,000
HEI Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Commitment fee percentage | 0.20% |  |  |  |  |  |  |
HEI Facility | Maximum |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Capitalization ratio required to be maintained as per the debt covenant |  |  |  |  |  |  | 50.00% |
Hawaiian Electric Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement | $ 275,000,000 |  |  |  |  |  |  |
Number of extension options | extensionOption | 2 |  |  |  |  |  |  |
Extension period | 1 year |  |  |  |  |  |  |
Commitment fee percentage | 0.175% |  |  |  |  |  |  |
Hawaiian Electric Facility | LIBOR |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Line of credit facility basis point spread | 1.25% |  |  |  |  |  |  |
Commercial paper |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Outstanding amount |  |  | $ 65,000,000 |  |  |  | $ 54,000,000 | $ 65,000,000
Weighted-average interest rate |  |  | 0.75% |  |  |  | 0.55% | 0.75%
Line of credit facility | Credit Facilities Effective July 2017 |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Number of financial institutions | institution | 9 |  |  |  |  |  |  |
Line of credit facility basis point spread | 1.375% |  |  |  |  |  |  |
Line of credit facility | HEI Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement | $ 175,000,000 |  |  |  |  |  |  |
Short-term debt, net |  |  | $ 0 |  |  |  | $ 0 | $ 0
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Weighted-average interest rate |  |  | 1.90% |  |  |  |  | 1.90%
Short-term debt, net |  |  | $ 49,979,000 |  |  |  | $ 0 | $ 49,979,000
Hawaiian Electric Company, Inc. and Subsidiaries | Credit Facilities Effective July 2017 |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Ratio of consolidated subsidiary debt to total consolidated capitalization required to be maintained as per the debt covenant | 65.00% |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | HEI Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement | $ 150,000,000 |  |  |  |  |  |  |
Ratio of consolidated capitalization required to be maintained as per the debt covenant |  |  |  |  |  |  | 35.00% |
Hawaiian Electric Company, Inc. and Subsidiaries | Commercial paper |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  | $ 0 |
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility | Credit Facilities Effective July 2017 |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Number of financial institutions | institution | 9 |  |  |  |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries | Line of credit facility | Hawaiian Electric Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement | $ 200,000,000 |  |  |  |  |  |  |
Short-term debt, net |  |  | 0 |  |  |  | $ 0 | $ 0
Hawaiian Electric | 364-Day Revolver | Revolving Credit Facility |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  | $ 75,000,000 |  |
Debt instrument term |  |  |  |  |  | 364 days |  |
Line of credit outstanding |  |  |  |  |  | $ 0 |  |
Hawaiian Electric | Term Loan | 364-Day Term Loan Credit Agreement |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |
Credit agreement |  |  |  |  | $ 50,000,000 | $ 65,000,000 |  |
Debt instrument term |  |  |  |  | 364 days | 364 days |  |
Payment of term laon |  |  | $ 50,000,000 |  |  |  |  |
Proceeds from private placement |  |  |  | $ 50,000,000 |  |  |  |
Extinguishment of debt amount |  | $ 15,000,000 |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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