Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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

Original Sheet No. 358F Original Sheet No. 358F : Effective

GENERAL TERMS AND CONDITIONS (Continued)

39. TRANSITION COST RECOVERY MECHANISMS (Continued)

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 revenue during the last year of the

Total Recovery Period to the total interruptible

transportation revenue during that same period.

39.3.4.5 Accounting Procedures for GSR Costs.

Transporter shall maintain separate principal and

interest subaccounts in Account No. 186 to record all

GSR Costs for each recovery mechanism implemented under

this Subsection 39.3.4. The principal subaccounts for

the reservation charge surcharges and/or GSR unit rate

will be debited with Transporter's applicable GSR Costs

permitted to be included in rates pursuant to order(s)

of FERC. Each month the principal subaccounts shall be

credited with an amount determined by applying the

principal portion of the reservation charge surcharges

to the actual applicable firm Rate Schedule(s) billing

quantities under Service Agreements with Applicable

Firm Shippers experienced during the month, and an

amount determined by applying the principal portion of

the GSR unit rate to the actual total Rate Schedule IT-

1 interruptible transportation throughput which was

billed the GSR unit rate during the month. The balance

is the result of applying the current month's credits

as calculated above against the prior month's balance.

The interest subaccounts will be debited and/or

credited monthly, as applicable, for interest accrued

or owed at the current FERC published interest rate,

and credited with an amount determined by applying the

interest portion of the reservation charge surcharges

to the actual applicable firm Rate Schedule(s) billing

quantities under Service Agreements with Applicable

Firm Shippers during the month and an amount determined

by applying the interest portion of the GSR unit rate

to the actual total Rate Schedule IT-1 interruptible

transportation throughput which was billed the GSR unit

rate during the month.