TSP Name: Northern Natural Gas Company TSP: 784158214 Notice ID: 103586 Notice Type: Rates and Charges Subject: INTERRUPTIBLE DEFERRED DELIVERY (IDD) ANNUAL ROLLOVER FEE Critical: N Post Date/Time: 03/13/2026 02:26 PM Notice Status: Initiate For Gas Day(s): 03/13/2026 - 04/16/2026 Notice Effective Date/Time: 03/13/2026 02:26 PM Notice End Date/Time: 04/16/2026 10:00 PM Required Response Indicator Description: 5-No response required Notice Text: The Annual Rollover Fee of $0.7404 per Dth will be assessed to any net positive or negative IDD contract inventory balance at the end of Gas Day March 31, 2026. In the event shippers elect to resolve March 2026 shipper imbalances to their IDD storage contracts (April 13-16, 2026, imbalance election period), this election will impact the net positive or negative IDD inventory balances for March and may increase or reduce the Annual Rollover charge billed. If you have any questions, please call your customer service or account representative.