OPERATIONAL FLOW ORDER IMBALANCE RESTRICTION AND CLAY BASIN RESERVOIR TEST REMINDER

Due to the Clay Basin Reservoir Test scheduled for March 27 through April 7, 2026, MountainWest Pipeline (MWP) will be unable to inject or withdraw from its Clay Basin balancing account. As a result, MWP will not be able to accept any imbalance payback nominations to or from the pipeline beginning Gas Days March 27 Timely cycle through April 7, 2026. During this period MWP is also requiring shippers and point operators align nominated and actual volumes. This operational flow order is consistent with MWP’s FERC Gas Tariff General Terms and Conditions Section 12.1.

Below is a reminder of the dates and restrictions associated with the Clay Basin Reservoir test:

March 27 through March 29: Field limited to physical withdrawal only. No injection nominations will be accepted.

March 30: The reservoir will be conditioned at a constant withdrawal rate of 325,000 Mcf (341,250 Dth) for 24 hours.

March 31: Reservoir test at a constant withdrawal rate of 350,000 Mcf (367,500 Dth) for 24 hours.

April 1 through April 7: Field shut-in. Only in-place transfer nominations will be processed.

April 8: Field returns to normal at 8:00 AM

If you have any questions, please contact your MWP Marketing or Contract Services Representative or the Customer Service Hotline at 801-584-6034.