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

Seventy-Third Revised Sheet No. 18 Seventy-Third Revised Sheet No. 18

Superseding: Seventy-Second Revised Sheet No. 18

NOTICE OF CURRENTLY EFFECTIVE RATES

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(ALL RATES ARE STATED IN CENTS PER DEKATHERM)

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

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COMMODITY CHARGE

MAXIMUM A/B/ RATE PER DKT 30.884 0.190 N.A. N.A. 31.074

MINIMUM A/B/ RATE PER DKT 3.120 0.190 N.A. N.A. 3.310

SCHEDULED OVERRUN CHARGE

MAXIMUM A/B/ RATE PER DKT 30.884 0.190 N.A. N.A. 31.074

MINIMUM A/B/ RATE PER DKT 3.120 0.190 N.A. N.A. 3.310

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A/ SHIPPER MUST REIMBURSE TRANSPORTER IN-KIND FOR TRANSPORTATION FUEL USE, LOST AND UNACCOUNTED FOR GAS. THE APPLICABLE PERCENTAGE IS 2.153%, CONSISTING OF 2.614% FOR

THE CURRENT PERCENTAGE AND (0.461%) 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 TRANSMISSION FACILITIES.

B/ SHIPPER MUST REIMBURSE TRANSPORTER FOR ELECTRIC POWER USED FOR TRANSPORTATION. THE APPLICABLE RATE IS 0.818 CENTS, CONSISTING OF 0.830 CENTS FOR THE CURRENT RATE

AND (0.012) 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 TRANSMISSION FACILITIES.