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Long-term debt (Details) - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Oct. 04, 2018 | May 30, 2018 | Dec. 31, 2017
Long-term debt |  |  |  |  |
Less unamortized debt issuance costs | $ (2,599,000) |  |  |  | $ (2,007,000)
Long-term debt, net—other than bank | 1,879,641,000 |  |  |  | 1,683,797,000
Aggregate principal payments |  |  |  |  |
2019 | 4,000,000 |  |  |  |
2020 | 100,000,000 |  |  |  |
2021 | 54,000,000 |  |  |  |
2022 | 206,000,000 |  |  |  |
2023 | 154,000,000 |  |  |  |
Contribution to maintain targeted equity capitalization structure | 71,000,000 |  |  |  |
Electric utility |  |  |  |  |
Aggregate principal payments |  |  |  |  |
2019 | 0 |  |  |  |
2020 | 96,000,000 |  |  |  |
2021 | 0 |  |  |  |
2022 | 52,000,000 |  |  |  |
2023 | 100,000,000 |  |  |  |
Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | 1,426,546,000 |  |  |  | 1,376,546,000
Unsecured Debt |  |  |  |  |
Aggregate principal payments |  |  |  |  |
Debt instrument, face amount |  |  | $ 150,000,000 |  |
Unsecured Debt | Mauo, LLC |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | 0 |  |  |  |
Aggregate principal payments |  |  |  |  |
Debt instrument, face amount |  | $ 50,500,000.0 |  |  |
Unsecured Debt | Mauo, LLC | LIBOR |  |  |  |  |
Aggregate principal payments |  |  |  |  |
Line of credit facility basis point spread |  | 1.375% |  |  |
Special purpose revenue bonds issued on behalf of electric utility subsidiaries |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | 1,418,802,000 |  |  |  | 1,368,479,000
Hamakua Energy 4.02% notes, due 2030 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 63,438,000 |  |  |  | 67,325,000
Debt instrument, stated interest rate | 4.02% |  |  |  |
HEI 2.99% term loan, due 2022 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 150,000,000 |  |  |  | 150,000,000
HEI 2.99% term loan, due 2022 | Term loan |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument, stated interest rate | 2.99% |  |  |  |
HEI 5.67% senior notes, due 2021 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 50,000,000 |  |  |  | 50,000,000
Debt instrument, stated interest rate | 5.67% |  |  |  |
HEI 3.99% senior notes, due 2023 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 50,000,000 |  |  |  | 50,000,000
Debt instrument, stated interest rate | 3.99% |  |  |  |
HEI 4.58% senior notes, due 2025 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument, stated interest rate | 4.58% |  |  |  |
HEI 4.58% senior notes, due 2025 | Term loan |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 50,000,000 |  |  |  | 0
HEI 4.72% senior notes, due 2028 | Senior notes |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument, stated interest rate | 4.72% |  |  |  |
HEI 4.72% senior notes, due 2028 | Term loan |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt | $ 100,000,000 |  |  |  | $ 0
HEI Series 2018A |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument, stated interest rate |  |  | 4.58% |  |
Aggregate principal payments |  |  |  |  |
Debt instrument, face amount |  |  | $ 50,000,000 |  |
HEI Series 2018A | Unsecured Debt |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 67,500,000 |
Debt instrument, stated interest rate |  |  |  | 4.38% |
HEI Series 2018A | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 52,000,000 |
HEI Series 2018A | Unsecured Debt | HELCO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | 9,000,000 |
HEI Series 2018A | Unsecured Debt | MECO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | 6,500,000 |
HEI Series 2018B |  |  |  |  |
Long-term debt |  |  |  |  |
Debt instrument, stated interest rate |  |  | 4.72% |  |
Aggregate principal payments |  |  |  |  |
Debt instrument, face amount |  |  | $ 100,000,000 |  |
HEI Series 2018B | Unsecured Debt |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 17,500,000 |
Debt instrument, stated interest rate |  |  |  | 4.53% |
HEI Series 2018B | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 12,500,000 |
HEI Series 2018B | Unsecured Debt | HELCO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | 3,000,000 |
HEI Series 2018B | Unsecured Debt | MECO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | 2,000,000 |
Series 2018C | Unsecured Debt |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 15,000,000 |
Debt instrument, stated interest rate |  |  |  | 4.72% |
Series 2018C | Unsecured Debt | Hawaiian Electric Company, Inc. and Subsidiaries |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 10,500,000 |
Series 2018C | Unsecured Debt | HELCO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | 3,000,000 |
Series 2018C | Unsecured Debt | MECO |  |  |  |  |
Long-term debt |  |  |  |  |
Gross long-term debt |  |  |  | $ 1,500,000 |

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