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RETIREMENT BENEFIT OBLIGATIONS | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Retirement Benefit Plans | NOTE 9: RETIREMENT BENEFIT OBLIGATIONS The Company co-sponsors the Unitil Corporation Retirement Plan (Pension Plan), the Unitil Retiree Health and Welfare Benefits Plan (PBOP Plan), and the Unitil Corporation Supplemental Executive Retirement Plan (SERP Plan) to provide certain pension and postretirement benefits for its retirees and current employees. Please see Note 10 to the Consolidated Financial Statements in the Company’s Form 10-K for the year ended December 31, 2020 as filed with the SEC on February 2, 2021 for additional information regarding these plans. The following table includes the key weighted average assumptions used in determining the Company’s benefit plan costs and obligations:
Used to Determine Plan Costs |  | 2021 |  |  | 2020 |
Discount Rate |  |  | 2.50 | % |  |  | 3.25 | %
Rate of Compensation Increase |  |  | 3.00 | % |  |  | 3.00 | %
Expected Long-term rate of return on plan assets |  |  | 7.50 | % |  |  | 7.40 | %
Health Care Cost Trend Rate Assumed for Next Year |  |  | 6.60 | % |  |  | 7.00 | %
Ultimate Health Care Cost Trend Rate |  |  | 4.50 | % |  |  | 4.50 | %
Year that Ultimate Health Care Cost Trend Rate is reached |  |  | 2029 |  |  |  | 2029 |
The following tables provide the components of the Company’s Retirement plan costs ($000’s):
|  | Pension Plan |  |  | PBOP Plan |  |  | SERP Plan |
Three Months Ended June 30, |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service Cost |  | $ | 868 |  |  | $ | 831 |  |  | $ | 758 |  |  | $ | 675 |  |  | $ | 88 |  |  | $ | 71 |
Interest Cost |  |  | 1,251 |  |  |  | 1,443 |  |  |  | 685 |  |  |  | 779 |  |  |  | 115 |  |  |  | 138 |
Expected Return on Plan Assets |  |  | (2,423 | ) |  |  | (2,255 | ) |  |  | (627 | ) |  |  | (516 | ) |  |  | — |  |  |  | — |
Prior Service Cost Amortization |  |  | 75 |  |  |  | 80 |  |  |  | 302 |  |  |  | 303 |  |  |  | 14 |  |  |  | 14 |
Actuarial Loss Amortization |  |  | 2,022 |  |  |  | 1,618 |  |  |  | 262 |  |  |  | 186 |  |  |  | 373 |  |  |  | 259 |
Sub-total |  |  | 1,793 |  |  |  | 1,717 |  |  |  | 1,380 |  |  |  | 1,427 |  |  |  | 590 |  |  |  | 482 |
Amounts Capitalized and Deferred |  |  | (887 | ) |  |  | (807 | ) |  |  | (791 | ) |  |  | (695 | ) |  |  | (178 | ) |  |  | (152 | )
Net Periodic Benefit Cost Recognized |  | $ | 906 |  |  | $ | 910 |  |  | $ | 589 |  |  | $ | 732 |  |  | $ | 412 |  |  | $ | 330 |
|  | Pension Plan |  |  | PBOP Plan |  |  | SERP Plan |
Six Months Ended June 30, |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service Cost |  | $ | 1,736 |  |  | $ | 1,662 |  |  | $ | 1,516 |  |  | $ | 1,350 |  |  | $ | 177 |  |  | $ | 142 |
Interest Cost |  |  | 2,502 |  |  |  | 2,887 |  |  |  | 1,370 |  |  |  | 1,559 |  |  |  | 229 |  |  |  | 275 |
Expected Return on Plan Assets |  |  | (4,846 | ) |  |  | (4,510 | ) |  |  | (1,254 | ) |  |  | (1,032 | ) |  |  | — |  |  |  | — |
Prior Service Cost Amortization |  |  | 150 |  |  |  | 160 |  |  |  | 604 |  |  |  | 606 |  |  |  | 28 |  |  |  | 28 |
Actuarial Loss Amortization |  |  | 4,044 |  |  |  | 3,236 |  |  |  | 524 |  |  |  | 372 |  |  |  | 745 |  |  |  | 518 |
Sub-total |  |  | 3,586 |  |  |  | 3,435 |  |  |  | 2,760 |  |  |  | 2,855 |  |  |  | 1,179 |  |  |  | 963 |
Amounts Capitalized and Deferred |  |  | (1,600 | ) |  |  | (1,437 | ) |  |  | (1,454 | ) |  |  | (1,227 | ) |  |  | (356 | ) |  |  | (290 | )
Net Periodic Benefit Cost Recognized |  | $ | 1,986 |  |  | $ | 1,998 |  |  | $ | 1,306 |  |  | $ | 1,628 |  |  | $ | 823 |  |  | $ | 673 |
Employer Contributions As of June 30, 2021, the Company had made $2.7 million and $1.6 million of contributions to its Pension Plan and PBOP Plan, respectively, in 2021. The Company, along with its subsidiaries, expects to continue to make contributions to its Pension and PBOP Plans in 2021 and future years at minimum required and discretionary funding levels consistent with the amounts recovered in the distribution utilities’ rates for these Pension and PBOP Plan costs. As of June 30, 2021, the Company had made $0.3 million of benefit payments under the SERP Plan in 2021. The Company presently anticipates making an additional $0.3 million of benefit payments under the SERP Plan in 202 1 .

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