Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 05/21/2010, Docket: RP10-621-000, Status: Effective

Original Sheet No. 19A Original Sheet No. 19A

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 FS-1

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VOLUMETRIC CAPACITY RELEASE CHARGES

CAPACITY RESERVATION

MAXIMUM RATE PER DKT 0.069 N.A. N.A. N.A. 0.069

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

CAPACITY DELIVERABILITY

MAXIMUM RATE PER DKT 6.266 N.A. N.A. N.A. 6.266

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