MountainWest Overthrust Pipeline

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Maintenance Construction Schedule - MountainWest Overthrust Pipeline

2025 Schedule

Period	Category	Preliminary Dates	Duration	Location	Project	Possible Customer Impact	Current Capacity (Dth/d)	Restricted Capacity (Dth/d)	Anticipated Firm Cut Quantity	Anticipated Total Nomination Cut %
September	Construction	September 9 - 26	18 Days	ML122	Overthrust West Compression Expansion	Capacity reduced to 240,000 Dth/d combined between MAP 10018 Roberson Creek and MAP 10443 QPC JL95 Interconnect using the Opal constraint.	MAP 10018 363,000 Dth/d, MAP 10443 82,500 Dth/d	240,000 Dth/d between MAP 10018 and MAP 10443, with a maximum of 69,500 Dth/d to MAP 10443.	116,000 Dth	33%
September	Construction	September 9 - 26	18 Days	ML122	Overthrust West Compression Expansion	No nominations at MAP 10030 Ruby Topaz, MAP 10025 Opal Processing Plant, MAP 10026 Pioneer Processing Plant, MAP 10017 Hams Fork MS.	MAP 10030 1,212,000 Dth/d. MAP 10025 1,000,000 Dth/d. MAP 10026 1,000,000 Dth/d. MAP 10017 583,000 Dth/d.	MAP 10030 0 Dth/d MAP 10025 0 Dth/d MAP 10026 0 Dth/d MAP 10017 0 Dth/d	ALL	100%
September - October	Construction	September 16 - October 1	16 Days	Rock Springs Compressor Station	Overthrust West Compression Expansion	Capacity reduction to 572,800 Dth/d combined between MAP 10005, MAP 10013 beginning Evening Cycle GD September 16, 2025 through cycle ID3 GD October 1, 2025. Nominations return to normal beginning Timely Cycle GD October 2, 2025.	MAP 10005 300,000 Dth/d, MAP 10013 825,000 Dth/d	MAP 10005 191,800 Dth/d, MAP 10013 381,000 Dth/d	0 Dth	0%
October	Construction	October 8 - 13	6 Days	Wamsutter	Overthrust West Compression Expansion	MAP 10827 capacity reduction to 330,000 Dth/d	MAP 10827 676,000 Dth/d	330,000 Dth/d MAP 10827 Wamsutter (REC)	260,000 Dth	45%

Note: This schedule is subject to change. It is recommended the Shippers monitor MountainWest Pipeline's critical notices about schedule revisions.