Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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

Original Sheet No. 358D Original Sheet No. 358D : Effective

GENERAL TERMS AND CONDITIONS (Continued)

39. TRANSITION COST RECOVERY MECHANISMS (Continued)

Transporter may from time to time, and at any time,

selectively and separately discount any or all of the

GSR unit rate for any Applicable Interruptible Shipper.

Such discounting, however, shall be in accordance with

Section 284.7(c)(5) of the FERC's Regulations and

Subsection 21.6 of these General Terms and Conditions.

The maximum GSR unit rate shall be included in the

interruptible transportation rates shown on Sheet No.

18 of this Tariff. The minimum rate for such GSR unit

rate is zero.

39.3.4.4 Annual Rate Schedule IT-1 GSR Unit Rate

Reconciliation - This provision provides a true-up

mechanism to ensure that Transporter neither

overrecovers nor underrecovers the costs included in

the GSR unit rate. On or before May 31 of each year,

Transporter shall recalculate the GSR unit rate to

reflect revisions for the actual FERC published

interest rates during the recovery period ending the

preceding March 31 applied to the unamortized balance

of the interruptible portion of the actual GSR Costs

paid by Transporter, reduced, as applicable, to reflect

interest owed by Transporter to Applicable

Interruptible Shippers on GSR Costs collected from

Applicable Interruptible Shippers during such portion

of the recovery period that such GSR Costs had not been

expended by Transporter. Additionally, Transporter

shall calculate revisions to the GSR unit rate to true-

up differences between the actual level of

interruptible transportation throughput billed the GSR

unit rate under Rate Schedule IT-1 during the recovery

period ending the preceding March 31 and the effective

total interruptible transportation throughput

underlying the GSR unit rate actually billed during

that same recovery period. In the event that

Transporter's actual interruptible transportation

throughput billed the GSR unit rate under Rate Schedule

IT-1 is greater than the total effective interruptible

transportation throughput underlying the GSR unit rate,

Transporter shall credit an amount to each of the

subsequent annual principal amounts equal to the

difference in throughput multiplied by the principal

portion of the currently effective GSR unit rate,