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EMPLOYEE BENEFITS | 6 Months Ended
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Jun. 30, 2026
Retirement Benefits [Abstract] |
EMPLOYEE BENEFITS | EMPLOYEE BENEFITS The following tables show the components of net periodic benefit cost (credit) (including amounts capitalized to our balance sheets) for our benefit plans:
|  | Pension Benefits
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Service cost |  | $ | 5.1 |  |  | $ | 4.8 |  |  | $ | 11.2 |  |  | $ | 10.5 |
Interest cost |  | 28.6 |  |  | 29.1 |  |  | 57.2 |  |  | 59.4 |
Expected return on plan assets |  | (42.6) |  |  | (43.6) |  |  | (85.4) |  |  | (87.7) |
Amortization of prior service credit |  | (0.1) |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |
Amortization of net actuarial loss |  | 10.9 |  |  | 9.5 |  |  | 21.3 |  |  | 23.1 |
Net periodic benefit cost (credit) |  | $ | 1.9 |  |  | $ | (0.3) |  |  | $ | 4.2 |  |  | $ | 5.2 |
|  | OPEB Benefits
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2026 |  | 2025 |  | 2026 |  | 2025
Service cost |  | $ | 3.1 |  |  | $ | 2.8 |  |  | $ | 6.2 |  |  | $ | 5.6 |
Interest cost |  | 6.5 |  |  | 6.3 |  |  | 13.2 |  |  | 12.8 |
Expected return on plan assets |  | (14.5) |  |  | (13.5) |  |  | (28.9) |  |  | (27.1) |
Amortization of prior service credit |  | (1.5) |  |  | (1.8) |  |  | (2.6) |  |  | (5.0) |
Amortization of net actuarial gain |  | (2.4) |  |  | (2.3) |  |  | (4.1) |  |  | (3.7) |
Net periodic benefit credit |  | $ | (8.8) |  |  | $ | (8.5) |  |  | $ | (16.2) |  |  | $ | (17.4) |
During the six months ended June 30, 2026, we made contributions and payments of $6.1 million related to our pension plans and $1.1 million related to our OPEB plans. We expect to make contributions and payments of $5.7 million related to our pension plans and $1.2 million related to our OPEB plans during the remainder of 2026, dependent upon various factors affecting us, including our liquidity position and possible tax law changes. Certain of our utility subsidiaries utilize escrow accounting for our current pension and OPEB costs, as approved by the PSCW. As of June 30, 2026 and December 31, 2025, our balance sheets included regulatory liabilities of $19.3 million and $14.7 million, respectively, for pension costs and regulatory assets of $7.9 million and $0.7 million, respectively, for OPEB costs. In accordance with our PSCW rate orders, we amortize the related regulatory assets and liabilities. The above tables do not reflect any adjustments for the creation or amortization of these regulatory assets and liabilities.

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