Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

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Effective Date: 12/01/2008, Docket: RP09-36-000, Status: Effective

Seventh Revised Sheet No. 231 Seventh Revised Sheet No. 231

Superseding: Sixth Revised Sheet No. 231

GENERAL TERMS AND CONDITIONS (Continued)

9. NOMINATION AND SCHEDULING PROCEDURES (Continued)

consistent with the priority of the transportation service used to

transport the gas to such interconnection.

10. ALLOCATION OF UNCOMMITTED CAPACITY

10.1 Firm services: Based on determinations made by Transporter, the

estimated amount of available uncommitted firm mainline, storage, and

receipt and/or delivery point capacity or capability will be posted by

Transporter via Transporter's Interactive Website. Transporter shall

determine the estimated amount of available uncommitted firm mainline

capacity by calculating the difference between the estimated capacity of

each line section as denoted on the system maps contained in this Tariff

and the amount of capacity that has been reserved by Shippers in each

such line section. The result shall be reflected by Transporter via

Transporter's Interactive Website as the estimated amount of uncommitted

firm mainline capacity by line section. Transportation service

providers should provide on request operationally available capacity

separate from unsubscribed capacity. However, due to the complexity of

Transporter's grid pipeline system, Transporter must evaluate its

ability to provide additional firm service pursuant to a firm service

request or bid, on a case by case basis to determine that the request(s)

is within the physical capacity or capability of Transporter's system

and will have no detrimental operational impacts. Actual available

uncommitted firm capacity on Transporter's transmission system is

dependent, among other things, upon the specific location and quantities

of the gas being received into or delivered out of Transporter's system

at key locations, the availability of transfer capacity into and out of

the various subsystems denoted on the system maps contained in this

Tariff, the direction of flow in the various pipeline line sections and

the supplies connected to the system.

10.2 All requests and/or bids for uncommitted firm transportation

capacity or storage capability (capacity) shall be submitted to

Transporter via Transporter's Interactive Website. Transporter shall

accept requests and/or bids for uncommitted firm capacity submitted via

an

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