Clay Basin Storage Overview

Natural Gas Storage	55.8 MMDth of Working Gas 66.21 Bcf of Cushion Gas
Interconnect Capacity (Dth/d)	MountainWest Pipeline Injection (217,000), Withdrawal (700,000) Northwest Pipeline Injection (250,000) Withdrawal (320,000) *Numbers listed are meter sizing, and actual volumes depend on pipeline conditions
Location	Daggett County, Utah (50 miles from Rock Springs, Wyoming) NE Corner of Utah near Wyoming and Colorado

General Information

Injection:: Injection season starts approximately May 1 to Oct 31

During the start of the injection season, the average injection volume is 300 MMcf

Formula for injection allocation = (X/Y) * Z

X = Firm Shipper’s annual working gas
Y = Sum of annual working gas of all firm shippers
Z = Available injection capacity on any day

Withdrawal:: Withdrawal season starts approximately Nov 1 to Mar 31

During the start of the withdrawal season, the average volume is 500 MMcf

The actual withdrawal rate varies with the working gas volume and the takeaway pipeline pressures

Formula for withdrawal allocation = [(A/B) * (C - D)] + E

A = Firm Shipper’s working gas remaining in storage
B = Total working gas remaining in storage for all shippers
C = Maximum possible reservoir deliverability
D = Sum of firm shipper’s minimum required deliverability
E = Firm shipper’s minimum required deliverability

Facilities:: 89,000 feet of 6 and 10 inch field lines
29 field dehydration units
44 injection and withdrawal wells

Compressors:: Five 2,600 HP reciprocating compressors
Three 6,500 HP turbine compressors
One 1,680 HP compressor (Park & Loan)

Please refer to our Contacts page for Marketing Contacts.

Reservation (Maximum): Monthly Deliverability: $2.85338
Monthly Capacity: $0.02378

Fuel is reimbursed in kind and calculated using utility and Compressor/Dehydration calculations
Clay Basin Conditioning Reimbursement Factor
Shippers arrange separately for transportation services to/from Clay Basin

Refer to the MWP Tariff for information regarding:

Background Information
- Issues and Negotiated Solutions
Cost of Service
- Liquids Revenue & Conditioning
- When Liquid Revenue is forecast to be below the required annual cost of service amount, MWP collects a Conditioning Reimbursement Factor
Annual Reimbursement Adjustment

This is not a legally binding document. Information derived from MWP’s Tariff For additional information, contact your Marketing/BD Rep.