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Retirement benefits (Tables) | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit cost for consolidated HEI | The components of net periodic pension costs (NPPC) and net periodic benefit costs (NPBC) for HEI consolidated and Hawaiian Electric consolidated were as follows:
|  |  |  |  |  | Pension benefits |  | Other benefits
Three months ended March 31 |  |  |  | 2021 |  | 2020 |  | 2021 |  | 2020
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
HEI consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | $ | 20,464 |  |  | $ | 18,363 |  |  | $ | 705 |  |  | $ | 631 |
Interest cost |  |  |  |  |  |  |  |  |  | 18,801 |  |  | 20,163 |  |  | 1,569 |  |  | 1,855 |
Expected return on plan assets |  |  |  |  |  |  |  |  |  | (33,067) |  |  | (28,466) |  |  | (3,233) |  |  | (3,038) |
Amortization of net prior period (gain)/cost |  |  |  |  |  |  |  |  |  | — |  |  | 3 |  |  | (383) |  |  | (440) |
Amortization of net actuarial losses 1 |  |  |  |  |  |  |  |  |  | 1,556 |  |  | 8,057 |  |  | 254 |  |  | 50 |
Net periodic pension/benefit cost (return) |  |  |  |  |  |  |  |  |  | 7,754 |  |  | 18,120 |  |  | (1,088) |  |  | (942) |
Impact of PUC D&Os |  |  |  |  |  |  |  |  |  | 11,167 |  |  | 6,262 |  |  | 970 |  |  | 777 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  |  |  |  |  |  |  |  |  | $ | 18,921 |  |  | $ | 24,382 |  |  | $ | (118) |  |  | $ | (165) |
Hawaiian Electric consolidated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  | $ | 19,994 |  |  | $ | 17,891 |  |  | $ | 699 |  |  | $ | 626 |
Interest cost |  |  |  |  |  |  |  |  |  | 17,531 |  |  | 18,715 |  |  | 1,504 |  |  | 1,782 |
Expected return on plan assets |  |  |  |  |  |  |  |  |  | (31,368) |  |  | (26,855) |  |  | (3,182) |  |  | (2,990) |
Amortization of net prior period (gain)/cost |  |  |  |  |  |  |  |  |  | — |  |  | 2 |  |  | (383) |  |  | (440) |
Amortization of net actuarial losses 1 |  |  |  |  |  |  |  |  |  | 2,559 |  |  | 7,368 |  |  | 250 |  |  | 51 |
Net periodic pension/benefit cost (return) |  |  |  |  |  |  |  |  |  | 8,716 |  |  | 17,121 |  |  | (1,112) |  |  | (971) |
Impact of PUC D&Os |  |  |  |  |  |  |  |  |  | 11,167 |  |  | 6,262 |  |  | 970 |  |  | 777 |
Net periodic pension/benefit cost (adjusted for impact of PUC D&Os) |  |  |  |  |  |  |  |  |  | $ | 19,883 |  |  | $ | 23,383 |  |  | $ | (142) |  |  | $ | (194) |
1 Three months ended March 31, 2021 amounts include the one-time cumulative impact of the change in accounting principle for the plans’ fixed income securities from the calculated market-related value method to the fair value method, which was recorded in the first quarter of 2021.

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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