Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 02/01/2000, Docket: RP00-165-000, Status: Effective

Original Sheet No. 358B Original Sheet No. 358B : Effective

GENERAL TERMS AND CONDITIONS (Continued)

39. TRANSITION COST RECOVERY MECHANISMS (Continued)

Transporter. Additionally, Transporter shall calculate

revisions to the reservation charge surcharges to true-

up differences between the actual level of Applicable

Firm Shippers' billing quantities experienced during

the recovery period ended the preceding March 31 and

the total Applicable Firm Shippers' billing quantities

underlying the reservation charge surcharges billed

during that same recovery period.

Once a recovery period has been trued-up in an annual

reconciliation filing to include actual billing

quantities, the applicable reservation charge

surcharges for that same recovery period shall not be

subject to further revision for a change in those

billing quantities.

Transporter shall bill the reservation charge

surcharges applicable to each Total Recovery Period

through the end of that Total Recovery Period, and

thereafter refund any overcollections or bill for any

undercollections of the reservation charge surcharges

with interest calculated in accordance with Section

154.501 of the FERC's Regulations. Each Applicable

Firm Shipper's share of such refunds or additional

billings shall be its pro rata proportion of the total

amount overcollected or undercollected, as applicable,

based on the ratio of that Shipper's applicable firm

Rate Schedule(s) revenue during the last year of the

Total Recovery Period to the total of that Shipper's

applicable firm Rate Schedule(s) revenue during that

same period.

39.3.4.2.1 In the event Transporter's actual

firm Rate Schedule(s) MDDQ billing quantities are

greater than the MDDQ billing quantities

underlying the surcharge, Transporter shall credit

an amount to each of the subsequent annual

principal amounts equal to the difference in MDDQ

billing quantities multiplied by the principal

portion of the currently effective reservation

charge surcharge, divided by the number of years

remaining in the Total Recovery Period, plus