TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 097901 Notice Type: TSP Capacity Offering Subject: OPEN SEASON FOR FIELD AND FIELD TO DEMARC CAPACITY BEGINNING APRIL 2026 Critical: N Post Date/Time: 10/31/2025 09:15 AM Notice Status: Initiate For Gas Day(s): 10/31/2025 - 01/31/2026 Notice Effective Date/Time: 10/31/2025 09:15 AM Notice End Date/Time: 01/31/2026 05:00 PM Required Response Indicator Description: 5-No response required Notice Text: Northern is hereby announcing an open season effective immediately for service commencing on April 1, 2026, for forward haul throughput service from receipt points located in Northern's Field Area MIDs 1-16A for deliveries in the Field Area MIDs 1-16B including Demarc (POI 37654). An open season for Field Area Backhaul Deliveries is pending. Receipt point capacity located in MIDs 1-16A will be awarded first to bids received in Field Area Backhaul Deliveries open season. As Northern is in the process of determining capacity impacts due to summer maintenance outages, details of the open season will be provided at a later date. The close date will be within 60 business days of this notice and is expected to be mid January 2026. From time to time, Northern may release and post portions of open season capacity for incremental or realignment requests from customers that can be bid upon prior to the open season close. If you have questions, please contact your marketing representative.