TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 105147 Notice Type: Computer System Status Subject: UPDATE 1: FLOWING GAS BUSINESS APPLICATION INTERRUPTION Critical: N Post Date/Time: 04/21/2026 07:40 AM Notice Status: Supersede Prior Notice: 105114 For Gas Day(s): 04/20/2026 - 04/21/2026 Notice Effective Date/Time: 04/21/2026 07:40 AM Notice End Date/Time: 04/22/2026 08:59 AM Required Response Indicator Description: 5-No response required Notice Text: Update 1: Northern has resolved the service interruptions; however, loading reports in Flowing Gas remains slow. We apologize for any inconvenience this may cause and will provide an update as soon as full system performance is restored. If you have any questions, please contact your customer service representative. Original Notice: Northern is currently experiencing a service interruption that is causing intermittent access to its Flowing Gas business application. As a result, customers are unable to view accounting reports.