TSP Name:                                  Northern Natural Gas Company
TSP:                                       784158214
Notice ID:                                 108618
Notice Type:                               Computer System Status
Subject:                                   NIGHTLY SYSTEM MAINTENANCE WINDOW EXTENSION ON WEDNESDAY, JUNE 23, 2026
Critical:                                  N
Post Date/Time:                            06/24/2026 09:00 AM
Notice Status:                             Initiate
For Gas Day(s):                            06/24/2026
Notice Effective Date/Time:                06/24/2026 09:00 PM
Notice End Date/Time:                      06/25/2026 06:00 AM
Required Response Indicator Description:   5-No response required

Notice Text: 


On Wednesday, June 24, 2026,
Northern will be performing application maintenance during the system
maintenance window, which typically occurs from 11:00 p.m. to 4:30 a.m. To
ensure there is adequate time to complete the maintenance, Northern will extend
the system maintenance window from 10:30 p.m. to 5:00 a.m. During this time, Northern
business applications will be unavailable. EDI transactions will be processed
after the application system returns to normal operations.



If you have any questions,
contact your customer service representative.