The following table includes the components of net periodic benefit cost (income) related to our defined benefit pension plans and other postretirement benefits for the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Pension Benefits (Pension Plan) | | Pension Benefits (ESSRP) | | Postretirement Benefits | | (in thousands) | 2026 | | 2025 | | 2026 | | 2025 | | 2026 | | 2025 | | | | | | | | | | | | | | Service Cost | $ | 815 | | | $ | 875 | | | $ | — | | | $ | — | | | $ | 173 | | | $ | 122 | | | Interest Cost | 4,307 | | | 4,326 | | | 459 | | | 473 | | | 457 | | | 402 | | | Expected Return on Assets | (6,242) | | | (6,191) | | | — | | | — | | | — | | | — | | | Amortization of Prior Service Cost | — | | | — | | | — | | | — | | | (917) | | | (949) | | | Amortization of Net Actuarial Loss | 712 | | | 336 | | | — | | | — | | | 102 | | | — | | | Net Periodic Benefit Cost (Income) | $ | (408) | | | $ | (654) | | | $ | 459 | | | $ | 473 | | | $ | (185) | | | $ | (425) | | | | | | | | | | | | | | | Six Months Ended June 30, | | Pension Benefits (Pension Plan) | | Pension Benefits (ESSRP) | | Postretirement Benefits | | (in thousands) | 2026 | | 2025 | | 2026 | | 2025 | | 2026 | | 2025 | | | | | | | | | | | | | | Service Cost | $ | 1,630 | | | $ | 1,751 | | | $ | — | | | $ | — | | | $ | 345 | | | $ | 245 | | | Interest Cost | 8,613 | | | 8,652 | | | 917 | | | 947 | | | 914 | | | 805 | | | Expected Return on Assets | (12,483) | | | (12,382) | | | — | | | — | | | — | | | — | | | Amortization of Prior Service Cost | — | | | — | | | — | | | — | | | (1,833) | | | (1,898) | | | Amortization of Net Actuarial Loss | 1,424 | | | 671 | | | — | | | — | | | 204 | | | — | | | Net Periodic Benefit Cost (Income) | $ | (816) | | | $ | (1,308) | | | $ | 917 | | | $ | 947 | | | $ | (370) | | | $ | (848) | |
The following table includes the impact of regulation on the recognition of periodic benefit cost (income) arising from pension and other postretirement benefits for the three and six months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | (in thousands) | 2026 | | 2025 | | 2026 | | 2025 | | | | | | | | | | Net Periodic Benefit Cost (Income) | $ | (134) | | | $ | (606) | | | $ | (269) | | | $ | (1,209) | | | Net Amount Amortized Due to the Effect of Regulation | 72 | | | 749 | | | 750 | | | 1,069 | | | Net Periodic Benefit Cost (Income) Recognized | $ | (62) | | | $ | 143 | | | $ | 481 | | | $ | (140) | |
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