Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 05/01/2003, Docket: RP03-323-000, Status: Effective

Fourth Revised Sheet No. 122 Fourth Revised Sheet No. 122 : Effective

Superseding: Third Revised Sheet No. 122

RATE SCHEDULE IS-1

INTERRUPTIBLE STORAGE SERVICE (Continued)

3. STORAGE SERVICE CHARGES

Distinct rates shall be charged for injection of gas into storage,

retention of gas in storage, and withdrawal of gas from storage for

Shipper's account under this Rate Schedule.

3.1 Applicable Rates: The applicable rates for service hereunder are

set forth on Sheet No. 20 of Transporter's Tariff, as it may be revised

from time to time. Such minimum and maximum rates shall not be

applicable to service provided pursuant to Section 51 of the General

Terms and Conditions of this Tariff.

3.2 For all storage service hereunder, Shipper shall pay Transporter

each month the sum of the following charges, as applicable:

3.2.1 Injection/Withdrawal Charge: Shipper shall be charged an

amount obtained by multiplying the unit injection charge and/or

the unit withdrawal charge set forth in the Service Agreement by

the quantity of gas in dkt injected into and/or withdrawn from

storage during the month.

3.2.2 Capacity Charge: Shipper shall, each month, be assessed

a capacity charge consisting of the product of Shipper's average

balance of gas held in storage during the month and the applicable

rate set forth in the Service Agreement.

3.3 Adjustment of Rates: Subject to the terms of the Service

Agreement, Transporter may prescribe and/or adjust at any time any of

the rates applicable to any individual Shipper without adjusting any

other rates for that or another Shipper; provided, however, that such

adjusted rate(s) shall not exceed the applicable maximum rate(s) nor

shall they be less than the

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