Exhibit 99.1 MIDDLESEX WATER ANNOUNCES 2023 YEAR END RESULTS ISELIN, NJ, (February 29, 2024) - Middlesex Water Company (“Middlesex” or the “Company”) (NASDAQ:MSEX) today announced financial results for the year ended December 31, 2023. 2023 OPERATING RESULTS Consolidated operating revenues increased to $166.3 million for the year ended December 31, 2023, up$3.8 million from 2022. factors affecting operating revenues were: · A net $4.2 million increase in our Middlesex System revenues due to the implementat ...