Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 10/01/2010, Docket: RP10-1140-000, Status: Effective

Forty-Fifth Revised Sheet No. 18A Forty-Fifth Revised Sheet No. 18A

Superseding: Forty-Fourth Revised Sheet No. 18A

NOTICE OF CURRENTLY EFFECTIVE RATES

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(ALL RATES ARE STATED IN CENTS PER DEKATHERM OR EQUIVALENT DEKATHERM AS INDICATED)

TOP GAS SUPPLY BASE TARIFF

BASE TARIFF ACA THROUGHPUT REALIGNMENT RATE PLUS

RATE SCHEDULE UNIT RATE SURCHARGE SURCHARGE SURCHARGE SURCHARGES

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RATE SCHEDULE IT-1 CONTINUED

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FIRM GATHERING CHARGE

MAXIMUM DAILY DELIVERY QUANTITY (MDDQ)

MAXIMUM RATE PER EQV. DKT PER MO. 1229.809 N.A. N.A. N.A. 1229.809

MINIMUM RATE PER EQV. DKT PER MO. 0.000 N.A. N.A. N.A. 0.000

COMMODITY GATHERING CHARGE

MAXIMUM A/B/ RATE PER DKT 1.384 N.A. N.A. N.A. 1.384

MINIMUM A/B/ RATE PER DKT 1.384 N.A. N.A. N.A. 1.384

INTERRUPTIBLE GATHERING CHARGE

MAXIMUM A/B/ RATE PER DKT 43.807 N.A. N.A. N.A. 43.807

MINIMUM A/B/ RATE PER DKT 1.384 N.A. N.A. N.A. 1.384

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A/ SHIPPER MUST REIMBURSE TRANSPORTER IN-KIND FOR GATHERING FUEL USE, LOST AND UNACCOUNTED FOR GAS. THE APPLICABLE PERCENTAGE IS 0.953%, CONSISTING OF 2.838% FOR THE

CURRENT PERCENTAGE AND (1.885%) FOR THE DEFERRAL PERCENTAGE. THIS PERCENTAGE SHALL BE APPLIED TO THE APPLICABLE QUANTITIES OF GAS TENDERED TO TRANSPORTER FOR

SHIPPER'S ACCOUNT AT THE RECEIPT POINT(S) INTO TRANSPORTER'S GATHERING FACILITIES.

B/ SHIPPER MUST REIMBURSE TRANSPORTER FOR ELECTRIC POWER USED FOR GATHERING. THE APPLICABLE RATE IS 2.000 CENTS, CONSISTING OF 2.696 CENTS FOR THE CURRENT RATE AND

(0.696) CENTS FOR THE DEFERRAL RATE. THIS RATE SHALL BE APPLIED TO THE APPLICABLE QUANTITIES OF GAS TENDERED TO TRANSPORTER FOR SHIPPER'S ACCOUNT AT THE RECEIPT

POINT(S) INTO TRANSPORTER'S GATHERING FACILITIES.