TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 103115 Notice Type: Planned Service Outage Subject: PLANNED SERVICE OUTAGES - FEBRUARY 2026 THROUGH OCTOBER 2026 Location: MARKET AND FIELD AREA Critical: N Post Date/Time: 02/26/2026 11:42 AM Notice Status: Supersede Prior Notice: 102815 For Gas Day(s): 02/26/2026 - 10/31/2026 Notice Effective Date/Time: 02/26/2026 11:42 AM 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 February 2026 through October 2026. 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. Market/Field Area Combined Allocation Group(s)/Point(s): Field to Demarc (Group 831) and Beatrice North (Group 832) Location: Northern's pipelines and compressor stations located between the Mullinville, Kansas, and Ogden, Iowa, compressor stations Project Description: Compressor station and pipeline maintenance Month: April 2026 through October 2026 Direction of Flow: Delivery: Field to Demarc (Group 831) and Beatrice North (Group 832) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Beatrice North (Group 832) and Field to Demarc (Group 831). Market Area Allocation Group(s)/Point(s): Carlton South (Group 811) Location: Near Willow River, Minnesota Project Description: Pipeline repair on the North Branch, Minnesota, to Carlton, Minnesota, mainline Month: February 2026 through October 2026 Direction of Flow: Receipt: Carlton South (Group 811) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Carlton South (Group 811). Revision: Capacity impacts for Carlton South have been included for April 2026 through October 2026. Allocation Group(s)/Point(s): Waterloo East (Group 773) and Earlville East (Group 487) Location: Northern's pipelines and compressor stations between Waterloo, Iowa, and Earlville, Iowa Project Description: Compressor station maintenance Month: April 2026 and May 2026 Direction of Flow: Delivery: Waterloo East (Group 773) and Earlville East (Group 487) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Waterloo East (Group 773) and Earlville East (Group 487). Allocation Group(s)/Point(s): Viking/NNG Pierz ITE (POI 61667) Location: Northern's compressor station located in Pierz, Minnesota Project Description: Compressor station and pipeline maintenance Month: May 2026 Direction of Flow: Receipt: Viking/NNG Pierz ITE (POI 61667) Capacity Impact: Northern anticipates primary firm service will be impacted for Viking/NNG Pierz ITE (POI 61667). Field Area Allocation Group(s)/Point(s): Holcomb Burdett (Group 5) Location: Northern's compressor station located in Bushton, Kansas Project Description: Compressor station maintenance Month: May 2026 Direction of Flow: Delivery: Holcomb Burdett (Group 5) Receipt: Holcomb Burdett (Group 5) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Holcomb Burdett (Group 5). 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 located in Spraberry, Texas Project Description: Compressor station and pipeline maintenance Month: April 2026 and May 2026 Direction of Flow: Delivery: Spraberry 12-inch (Group 601) and Spraberry 16-inch (Group 1112) Receipt: Spraberry Station (Group 602) Capacity Impact: Primary firm service will not be impacted for Spraberry Station (Group 602). Northern does not anticipate primary firm service will be impacted for Spraberry 12-inch (Group 601) and Spraberry 16-inch (Group 1112). Revision: Capacity impacts for Spraberry 12-inch (Group 601), Spraberry 16-inch (Group 1112) and Spraberry Station (Group 602) have been included for April 2026 through May 2026. Allocation Group(s)/Point(s): Sunray Low (Group 10), Sunray High (Group 32) and ETC Sunray Plant (POI 58676) Location: Northern's compressor station located in Sunray, Texas Project Description: Compressor station and pipeline maintenance Month: April 2026 and May 2026 Direction of Flow: Receipt: Sunray Low (Group 10), Sunray High (Group 32) and ETC Sunray Plant (POI 58676) Capacity Impact: Primary firm service will not be impacted for Sunray High (Group 32). Northern anticipates primary firm service will be impacted for Sunray Low (Group 10) and ETC Sunray Plant (POI 58676). Allocation Group(s)/Point(s): Beaver North (Group 1025), Beaver C & Beaver North (Group 1080), Brownfield North (Group 1022), Pampa North (Group 1023) and Beaver C System (Group 31) Location: Northern's compressor stations and pipeline between Florey, Texas, and Mullinville, Kansas Project Description: Compressor station and pipeline maintenance Month: May 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) Capacity Impact: Northern does not anticipate primary firm service will be impacted for Brownfield North (Group 1022) and Pampa North (Group 1023). Primary firm service will not be impacted for Beaver North (Group 1025), Beaver C & Beaver North (Group 1080) and Beaver C System (Group 31). Allocation Group(s)/Point(s): PEPL/NNG Mullinville (POI 173) and ANR/NNG Greensburg (POI 179) Location: Northern's compressor station located in Mullinville, Kansas Project Description: Compressor station maintenance Month: May 2026 Direction of Flow: Delivery: ANR/NNG Greensburg (POI 179) Receipt: PEPL/NNG Mullinville (POI 173) Capacity Impact: Northern does not anticipate primary firm service will be impacted for PEPL/NNG Mullinville (POI 173). Primary firm service will not be impacted for ANR/NNG Greensburg (POI 179). 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.