Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 09/01/2003, Docket: RP03-286-000, Status: Suspended

Sixth Revised Sheet No. 123 Sixth Revised Sheet No. 123 : Suspended

Superseding: Substitute Fifth Revised Sheet No. 123

RATE SCHEDULE IS-1

INTERRUPTIBLE STORAGE SERVICE (Continued)

3. STORAGE SERVICE CHARGES (Continued)

applicable minimum rate(s) set forth on Sheet No. 20 of this Tariff, or

any superseding tariff. Should Transporter and Shipper negotiate a

specific discount rate, such downward price adjustment shall be for a

specific term and shall apply only if one or more of the following

instances occur: (1) specified volumes under such Service Agreement are

achieved; (2) during specified periods of the year or for a specifically

defined period; and/or (3) to specified receipt/delivery points,

subsystem(s) and/or other defined geographical area(s). A discount

agreement which provides for an agreed discount as to a specified volume

will not be invalidated if the Shipper transports an incremental volume

above that specified volume. Such incremental volume will be priced at

a mutually agreeable price between Transporter and Shipper. Unless

otherwise agreed, at the expiration of the stated primary term specified

in Exhibit "A" of the Service Agreement, the rate(s) for service

hereunder shall be the maximum allowable rate(s) under this Rate

Schedule.

4. MINIMUM MONTHLY BILL

None.

5. AUTHORIZED SCHEDULED OVERRUN STORAGE

Upon request of Shipper and at Transporter's option, Transporter may

receive for injection and/or withdraw for Shipper's account, on any day,

quantities of gas in excess of Shipper's Interruptible Injection and/or

Withdrawal Quantities. Such quantities shall be injected and/or

withdrawn on an interruptible basis. For such excess gas injected

and/or withdrawn, Shipper shall pay an amount obtained by multiplying

the quantity of such excess gas during the month by the Scheduled

Overrun Charge.

6. FUEL AND ELECTRIC POWER REIMBURSEMENT

Shipper shall reimburse Transporter in-kind for fuel use, lost and

unaccounted for gas and in-dollars for electric power use in accordance

with Subsection 1.15 and Section 38 of the General Terms and Conditions.