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Credit agreements and changes in debt - Narrative (Details) | Oct. 29, 2020 | Sep. 28, 2020 USD ($) MW | May 19, 2020 USD ($) | Apr. 20, 2020 USD ($) institution | Sep. 30, 2020 USD ($) institution | Sep. 11, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Credit agreement |  |  |  |  |  |  |
Number of financial institutions | institution |  |  |  |  | 8 |  |
Line of credit outstanding |  |  |  |  | $ 0 |  | $ 0
Hawaiian Electric (parent only) |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Extinguishment of debt |  |  | $ 100,000,000 |  |  |  |
Hawaiian Electric (parent only) | 364-Day Revolver | Revolving Credit Facility |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Number of financial institutions | institution |  |  |  | 4 |  |  |
Credit agreement |  |  |  | $ 75,000,000 |  |  |
Line of credit outstanding |  |  |  |  | 0 |  |
Line of credit facility | HEI Facility |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Credit agreement |  |  |  |  | 150,000,000 |  |
Increase in borrowing capacity |  |  |  | 65,000,000 |  |  |
Threshold debt proceeds applied as repayment of term loan |  |  |  | $ 50,000,000 |  |  |
Line of credit facility | Hawaiian Electric (parent only) | Hawaiian Electric Facility |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Credit agreement |  |  |  |  | $ 200,000,000 |  |
Term Loan |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Number of financial institutions | institution |  |  |  | 2 |  |  |
Credit agreement |  |  |  | $ 65,000,000 |  |  |
Term Loan | Hawaiian Electric (parent only) | 364-Day Term Loan Credit Agreement |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Credit agreement |  |  | 50,000,000 |  |  |  |
Threshold debt proceeds applied as repayment of term loan |  |  | 75,000,000 |  |  |  |
Draw down of debt |  |  | $ 50,000,000 |  |  |  |
Term Loan | KWCL | Non-recourse Term Loan Agreement |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Aggregate principal amount |  | $ 13,000,000 |  |  |  |  |
Solar facility (in MW) | MW |  | 6 |  |  |  |  |
Minimum debt service coverage ratio |  | 1.10 |  |  |  |  |
Periodic principal and interest payments |  | $ 400,000 |  |  |  |  |
Term Loan | KWCL | Non-recourse Term Loan Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |
Senior Notes | HEI Notes |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 50,000,000 |
Fixed interest rate |  |  |  |  |  | 2.98% |
Senior Notes | HEI Notes | On or Prior to December 29, 2020 |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Redemption amount |  |  |  |  |  | $ 50,000,000 |
Senior Notes | The Notes | Subsequent Event |  |  |  |  |  |  |
Credit agreement |  |  |  |  |  |  |
Written notice to purchaser requirement, period prior to funding | 7 days |  |  |  |  |  |

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- Definition Debt Instrument, Covenant, Service Coverage Ratio, Minimum + References No definition available. + Details
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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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