Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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

Original Sheet No. 358E Original Sheet No. 358E : Effective

GENERAL TERMS AND CONDITIONS (Continued)

39. TRANSITION COST RECOVERY MECHANISMS (Continued)

divided by the number of years remaining in the Total

Recovery Period, plus applicable interest. In the

event that Transporter's actual interruptible

transportation throughput billed the GSR unit rate

under Rate Schedule IT-1 is less than the effective

total interruptible transportation throughput

underlying the GSR unit rate, Transporter shall debit

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, divided by the number of years

remaining in the Total Recovery Period, plus applicable

interest.

Transporter shall tender, as part of an "Annual

Reconciliation" filing, the GSR unit rate to be

assessed commencing the next July 1, reflecting such

recalculations, plus related interest calculated in

accordance with Section 154.501 of the FERC's

Regulations. The adjusted GSR unit rate resulting from

the Annual Reconciliation filing shall be effective on

July 1 following the filing of the Annual

Reconciliation. Such GSR unit rate(s) shall be

determined by dividing the next annual principal

amount, as adjusted, plus any adjustment to interest

for the prior period(s), plus applicable future

interest, by the effective total interruptible

transportation throughput applicable to the next annual

period.

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

reconciliation filing to include actual throughput, the

GSR unit rate for that same recovery period shall not

be subject to revision for a change in effective total

interruptible transportation throughput.

Transporter shall bill the GSR unit rate 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

GSR unit rate with interest calculated in accordance

with Section 154.501 of the FERC's Regulations. Each