Company: MSEX
Filing Date: 2025-03-11
Form Type: 10-K/A
Source: 0001174947-25-000318
Chunk: 30

Company: MIDDLESEX WATER CO
Filing Date: 2025-03-11
Form: 10-K/A
Chunk 30
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5,865 | ) |     |      | (7,041 | ) |     |                     | (3,384 | ) |     |      | (3,082 | ) |     |      | (3,547 | ) |
| Amortization of Net Actuarial Loss (Gain) |     |                          |    153 |   |     |      |    658 |   |     |      |  1,674 |   |     |                     | (1,098 | ) |     |      |   (191 | ) |     |      |      — |   |
| Net Periodic Benefit Cost*                |     | $                        |   (619 | ) |     | $    |    614 |   |     | $    |     37 |   |     | $                   | (2,849 | ) |     | $    | (1,274 | ) |     | $    | (1,423 | ) |

*

Amounts that are expected to be amortized from Regulatory Assets into
Net Periodic Benefit Cost in 2025 are as follows:

|                       |     | (In Thousands) 
 Pension        
 Plan           |    |     | Other    
 Benefits 
 Plan     |        |   |
|:----------------------|:----|:---------------|---:|:----|:---------|:-------|:--|
| Actuarial Loss (Gain) |     | $              | 50 |     | $        | (1,127 | ) |

23

The discount rate and compensation increase rate for determining our
postretirement benefit plans’ benefit obligations and costs as of and for the years ended December 31, 2024, 2023 and 2022, respectively,
are as follows:

|                                |     | Pension Plan |       |     |      |       |     |      |       |     | Other Benefits Plan |       |     |      |       |     |      |       |
|                                |     |         2024 |       |     | 2023 |       |     | 2022 |       |     |                2024 |       |     | 2023 |       |     | 2022 |       |
| Weighted Average Assumptions:  |     |              |       |     |      |       |     |      |       |     |                     |       |     |      |       |     |      |       |
| Expected