TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 100800 Notice Type: Storage Subject: FIRM STORAGE MINIMUM PERIODIC ACCOUNT BALANCE QUANTITY FOR JANUARY 31, 2026 Critical: N Post Date/Time: 01/15/2026 01:30 PM Notice Status: Initiate For Gas Day(s): 01/15/2026 - 02/18/2026 Notice Effective Date/Time: 01/15/2026 01:30 PM Notice End Date/Time: 02/18/2026 10:00 AM Required Response Indicator Description: 5-No response required Notice Text: Firm Deferred Delivery (FDD) customers that have elected 3-Step, 4-Step or Gas-in-Place (GIP) service options with an inventory level at the end of the Gas Day January 31, 2026, below the minimum period account balance quantity stated on the Appendix A of the customers' FDD contracts will incur an authorized overrun charge of $0.2373 per Dth on the quantity below the period minimum. Contracts are aggregated by legal entity and the same storage service type to determine the quantities subject to the authorized overrun charge. In the event a customer elects to use FDD to resolve its January 2026 transportation imbalances during the imbalance election period (February 12-18, 2026), this election will impact its end of day January 31, 2026, inventory billing balance and may result in an additional fee. If you have any questions, please contact your marketing or customer service representative.