TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 107654 Notice Type: Planned Service Outage Subject: PLANNED SERVICE OUTAGES - JUNE 2026 THROUGH OCTOBER 2026 Location: MARKET AND FIELD AREA Critical: N Post Date/Time: 06/06/2026 04:38 PM Notice Status: Supersede Prior Notice: 107481 For Gas Day(s): 06/06/2026 - 10/31/2026 Notice Effective Date/Time: 06/06/2026 04:05 PM Notice End Date/Time: 11/01/2026 08:59 AM Required Response Indicator Description: 5-No response required Notice Text: Northern has scheduled the service outages that will affect operating capacity within the months of June 2026 through October 2026. Please review the Planned Service Outage Summary for detailed information related to each outage. A brief description of the most recent change(s) to the Planned Service Outage Summary follows. Northern completed station maintenance at the Brownfield, Texas compressor station. As a result, capacity impacts for Beaver C and Beaver System North (Group 1080), Brownfield North (Group 1022), Pampa North (Group 1023) and Beaver C System (Group 31) have been updated for the Intraday 3 nomination cycle for Gas Day Saturday, June 6, 2026. Field Area Allocation Group(s)/Point(s): Beaver North (Group 1025), Beaver C & Beaver North (Group 1080), Brownfield North (Group 1022), Pampa North (Group 1023), Beaver C System (Group 31) and Mitchell to Gaines (Group 825) Location: Northern's compressor stations and pipeline between Florey, Texas, and Mullinville, Kansas Project Description: Compressor station and pipeline maintenance Month: June 2026 through July 2026 Direction of Flow: Delivery: Beaver North (Group 1025), Beaver C & Beaver North (Group 1080), Brownfield North (Group 1022) and Pampa North (Group 1023) Receipt: Beaver C System (Group 31) and Mitchell to Gaines (Group 825) Capacity Impact: Primary firm service will be impacted for Brownfield North (Group 1022) and Mitchell to Gaines (Group 825). Northern does not anticipate primary firm service will be impacted for Beaver C and Beaver System North (Group 1080) and Pampa North (Group 1023). Primary firm service will not be impacted for Beaver North (Group 1025) and Beaver C System (Group 31). Revision: Capacity impacts for Beaver C and Beaver System North (Group 1080), Brownfield North (Group 1022), Pampa North (Group 1023) and Beaver C System (Group 31) have been updated for June 2026. Please see Operationally Available Capacity on Northern's website for current flow information and the Field Area Group Allocation Maps andMarket Area Group Allocation Maps for a list of impacted points. If you have any questions, contact your customer service or marketing representative.