Chesapeake Utilities Environmental Rider Rate Change

BEFORE THE PUBLIC SERVICE COMMISSION OF THE STATE OF DELAWARE IN THE MATTER OF THE APPLICATION OF ) CHESAPEAKE UTILITIES CORPORATION ) FOR APPROVAL OF A CHANGE IN ITS ) PSC DOCKET NO. 25-1208 ENVIRONMENTAL RIDER RATE “ER” TO BE ) EFFECTIVE DECEMBER 1, 2025 ) (FILED OCTOBER 31, 2025) ) P U B L I C N O T I C E TO: ALL NATURAL GAS CUSTOMERS OF CHESAPEAKE UTILTIES CORPORATION AND OTHER INTERESTED PERSONS The Delaware Public Service Commission (the “Commission”) will conduct a public comment session and evidentiary hearing concerning the above-captioned case (as further explained below) at the following time and location: Date & Time Location Wednesday, February 18, 2026 Hearing Room at 1:00 p.m. Delaware Public Service Commission 861 Silver Lake Boulevard Cannon Building Dover, DE 19904 This meeting will be conducted via a hybrid meeting format using video conference technology. Video conference information can be found by visiting the Commission’s website seven (7) days prior to the hearing at: https://depsc.delaware.gov/commission-meetings/ Chesapeake Utilities Corporation’s Environmental Rider Rate Pursuant to the environmental remediation recovery mechanism approved in PSC Order No. 4104 (December 19, 1995) in PSC Docket No. 95-73, Chesapeake Utilities Corporation (“Chesapeake”) has filed an application (the “Application”) with the Commission proposing a decrease of the Environmental Rider (“ER”) surcharge of $0.0012 per Ccf ($0.00116 per Therm) to $0.00077 per Ccf ($0.00074 per Therm) for all firm delivery customers. The rate will be

effective with usage on and after December 1, 2025, with proration, subject to modification and refund after an evidentiary hearing. For a typical residential heating customer using 120 Therms of gas per month, the proposed ER rate will decrease their total monthly bill by approximately 0.03%, or $0.05. By Order No. 10875 dated November 19, 2025 the Commission approved the proposed rates to become effective with usage on and after December 1, 2025, with proration, subject to modification and refund after an evidentiary hearing. You are invited to review Chesapeake’s application and supporting documents to determine how your interests may be affected by going to DelaFile (https://delafile.delaware.gov), the Commission’s file management system, and by searching for Docket No. 25-1208. Interested persons or entities are afforded the opportunity to file comments or objections to the proposed change in the ER rate. Such comments or objections shall be filed on or before January 30, 2026 using DelaFile. If you wish to formally participate as a party in this matter, with the right to present evidence and be represented by counsel, you must file with the Commission a petition asking for leave to intervene in accordance with the requirements of the Commission's Rules of Practice and Procedure (26 Del. Admin. C. §1001-2.9) on or before January 5, 2026. All such petitions should be also be filed in DelaFile according to the Commission’s Rules ((26 Del. Admin. C. §1001-1.6.4). Petitions for intervention that are not received by the Commission on or before January 5, 2026, will not be granted unless good cause is shown. If intervention status is granted, any intervenor wishing to oppose the Application must file pre-filed testimony with the Commission on or before January 30, 2026. Any submissions sent by an intervenor that are not received by the Commission

on or before January 30, 2026 will not be considered. Such submissions shall be filed using DelaFile to be served on the persons identified in Order No. 10875 in this docket. On February 18, 2026, starting at 1:00 p.m., the Commission will consider whether to grant Chesapeake’s Application. The evidentiary hearing will be held at the Commission’s office located at 861 Silver Lake Boulevard, Cannon Building, Suite 100, Dover, Delaware 19904. The Commission will render a decision based upon the evidence presented to it at this evidentiary hearing. In addition, the Commission will accept public comments on the Application immediately prior to the commencement of the evidentiary hearing on February 18, 2026. If you would like to review documents at the Commission’s offices, please contact Crystal Beenick at (302) 736-7500 or by sending an email addressed Crystal.Beenick@delaware.gov. If you wish to request copies of documents in this matter, please submit a Freedom of Information Act Request Form. The link to this form can be found on the Commission’s website, https://depsc.delaware.gov, or by visiting this web address https://sos.delaware.gov/foia-requests/. The Commission will respond to your request in accordance with the Delaware Freedom of Information Act, 29 Del. C. ch. 100. If you have a disability and wish to participate or to review the materials in this matter, please contact the Commission to discuss any auxiliary aids or services you might need to help you. You may contact the Commission in person, by writing, by telephone (including text telephone), by Internet e-mail, or other means. If you have questions about this matter, you may call the Commission at 1-800-282-8574 (toll-free in Delaware) or (302) 736-7500 (voice and text telephone). You may also send questions regarding this matter by Internet e-mail addressed to PSC@Delaware.gov with the subject line “PSC Docket No. 25-1208”.