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TSP Name Columbia Gas Transmission, LLC TSP 054748041 Notice Type Description: Force Majeure Notice Stat Desc: Initiate Prior Notice: Critical: Y Reqrd Rsp Desc: No Response Required Post Notice Effective Notice End Response Post Date: 10/14/26 10/14/26 11/14/26 Subject: Subject: Force Majeure – MXP Line, Effective October 14, 2026 Author: Author: Tyler King Notice Text Columbia Gas Transmission, LLC (TCO) notifies customers of the need for an immediate pressure reduction on MXP Line-100. This immediate pressure reduction is due to a detected leak near the Saunders Creek Regulator Station in West Virginia. TCO notes that this detected leak is unrelated to the force majeure declared on September 24, 2026 (Notice ID 26276009). This event could not be prevented by TCO’s due diligence, and the immediate pressure reduction is necessary to maintain the safety and reliability of TCO’s system. Consequently, pursuant to Section 15 of the General Terms and Conditions of TCO’s FERC Gas Tariff, TCO is declaring a Force Majeure effective for Gas Day October 14, 2026. As a result, effective Intraday 3 Cycle for Gas Day Wednesday, October 14, 2026, scheduled volumes through the MXPSEG MA42 internal constraint (MXPSEG) will be reduced to EPSQ (13/24 = 54.16666%). Effective Evening Cycle for Gas Day Thursday, October 15, 2026, and until further notice, MXPSEG will be reduced to zero total capacity. Based on current nominations, the estimated impact to firm service is 1.9 MMDth. TCO is actively working to assess and remedy the situation in an expeditious manner, and will provide customers an update by Friday morning, October 16, 2026. Please continue to monitor critical notices for any adjustments related to this Force Majeure. Reservation charge credits (RCCs) will be determined per the process set forth in the General Terms and Conditions, Section 38 of TCO’s FERC Gas Tariff (“Tariff”). However, TCO will only issue RCCs if TCO is unable to schedule or deliver primary firm nominated capacity as a result of the Force Majeure for a period greater than ten consecutive days. In the event RCCs are issued as set forth in the Tariff, shippers will receive RCCs based on its 7-day average usage quantity less any scheduled quantities on the contract. By means of this notice, TCO is establishing which specific Gas Days will be included when determining a shipper’s 7-day average usage quantity pursuant to the provisions in the Tariff. Please contact your Customer Services and/or Marketing Representative with any questions.