TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 096885 Notice Type: Planned Service Outage Subject: PLANNED SERVICE OUTAGES - OCTOBER 2025 THROUGH DECEMBER 2025 Location: MARKET AND FIELD AREA Critical: N Post Date/Time: 10/08/2025 02:03 PM Notice Status: Supersede Prior Notice: 096444 For Gas Day(s): 10/08/2025 - 12/31/2025 Notice Effective Date/Time: 10/08/2025 02:03 PM Notice End Date/Time: 01/01/2026 08:59 AM Required Response Indicator Description: 5-No response required Notice Text: Northern has scheduled the following service outages that will affect operating capacity within the months of October 2025 through December 2025. Please review the Planned Service Outage Summaryfor detailed information related to each outage. A brief description of the most recent change(s) to the Planned Service Outage Summary follows. Field Area Allocation Group(s)/Point(s): Sunray Low (Group 10), Sunray High (Group 32) and ETC Sunray Plant (POI 58676) Location: Northern's compressor station in Sunray, Texas Project Description: Station maintenance Month: October 2025 Direction of Flow: Receipt: Sunray Low (Group 10), Sunray High (Group 32) and ETC Sunray Plant (POI 58676) Capacity Impact: Northern anticipates primary firm service will be impacted for Sunray Low (Group 10) and ETC Sunray Plant (POI 58676). Northern does not anticipate primary firm service will be impacted for Sunray High (Group 32). Revision: Capacity impacts for Sunray Low (Group 10) and Sunray High (Group 32) have been updated for October 2025. Allocation Group(s)/Point(s): Seminole Subsystem (Group 598), El Paso/NNG Waha (POI 57100), Permian Highway Delivery (POI 79489), GCX Waha (POI 79415), Oasis/NNG Waha (POI 62148), Trans-Pecos Hub Pecos Co (POI 79311) and ONEOK WesTex Reeves (POI 152) Location: Northern's pipeline south of Kermit, Texas Project Description: Pipeline maintenance Months: October 2025 Direction of Flow: Delivery: Seminole Subsystem (Group 598), El Paso/NNG Waha (POI 57100), Permian Highway Delivery (POI 79489), GCX Waha (POI 79415), Oasis/NNG Waha (POI 62148), Trans-Pecos Hub Pecos Co (POI 79311) and ONEOK WesTex Reeves (POI 152) Capacity Impact: Primary firm service will be impacted for Permian Highway Delivery (POI 79489) and GCX Waha (POI 79415). Northern does not anticipate primary firm service will be impacted for El Paso/NNG Waha (POI 57100) and Oasis/NNG Waha (POI 62148). Primary firm service will not be impacted for Seminole Subsystem (Group 598), Trans-Pecos Hub Pecos Co (POI 79311) and ONEOK WesTex Reeves (POI 152). Revision: Capacity impacts for Seminole Subsystem (Group 598), El Paso/NNG Waha (POI 57100), Permian Highway Delivery (POI 79489), GCX Waha (POI 79415), Oasis/NNG Waha (POI 62148), Trans-Pecos Hub Pecos Co (POI 79311) and ONEOK WesTex Reeves (POI 152) have been updated for October 2025. Northern does not anticipate primary firm service will be impacted for El Paso/NNG Waha (POI 57100) and Oasis/NNG Waha (POI 62148). Allocation Group(s)/Point(s): Spraberry 12-inch (Group 601), Spraberry 16-inch (Group 1112) and Spraberry Station (Group 602) Location: Northern's compressor station in Midland, Texas Project Description: Station maintenance Month: October 2025 through December 2025 Direction of Flow: Delivery: Spraberry 12-inch (Group 601) and Spraberry 16-inch (Group 1112) Receipt: Spraberry Station (Group 602) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Spraberry 12-inch (Group 601). Primary firm service will not be impacted for Spraberry Station (Group 602) and Spraberry 16-inch (Group 1112). Revision: Capacity impacts for Spraberry Station (Group 602) have been updated for October 2025. Please see Operationally Available Capacityon Northern's website for current flow information and the Field Area Group Allocation Mapsand Market Area Group Allocation Mapsfor a list of impacted points. If you have any questions, contact your customer service or marketing representative.