Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 08/06/1996, Docket: RP96-332-000, Status: Effective

Second Revised Sheet No. 355 Second Revised Sheet No. 355 : Effective

Superseding: 2nd Substitute Original Sheet No. 355

GENERAL TERMS AND CONDITIONS (Continued)

39. TRANSITION COST RECOVERY MECHANISMS (Continued)

GSR unit costs 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 base rate GSR unit

costs resulting from the Annual Reconciliation

filing shall be effective on July 1 following

the filing of the Annual Reconciliation. Such

base rate GSR unit cost(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 base rate GSR unit cost for

that same recovery period shall not be subject

to revision for a change in effective total

interruptible transportation throughput.

Transporter shall bill the base rate GSR unit

cost 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 base rate

GSR unit cost with interest calculated in

accordance with Section 154.501 of the FERC's

Regulations. Each Applicable Interruptible

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 Applicable Interruptible

Shipper's Rate Schedule IT-1 transportation

throughput to which the base rate GSR unit

cost was applied during the last year of the

Total Recovery Period to the total

interruptible