Williston Basin Interstate Pipeline Co.

Second Revised Volume No. 1

Effective Date: 08/23/2004, Docket: RP04-410-000, Status: Effective

Fourth Revised Sheet No. 246 Fourth Revised Sheet No. 246 : Effective

Superseding: Substitute Third Revised Sheet No. 246

GENERAL TERMS AND CONDITIONS (Continued)

15. BALANCING AND NOMINATION VARIANCE PROCEDURES (Continued)

Price described below and the resulting dollars will be paid (i) by

Transporter to Shipper where total receipts (net of any fuel

reimbursement provided in-kind) are greater than total deliveries under

a transportation Service Agreement or (ii) by Shipper to Transporter

where total deliveries are greater than total receipts (net of any fuel

reimbursement provided in kind) under a transportation Service

Agreement:

% Excess Receipts Excess Deliveries

Excess Index Price Index Price

Rec/Del Multiplier Multiplier

--------- --------------- -----------------

0 to 4% 100% 100%

4 to 10% 80% 120%

10 to 15% 70% 130%

15 to 20% 60% 140%

Over 20% 50% 150%

15.5.1 The Index Price shall be derived from the Daily Price

Survey, Midpoint index price, published in Platt's "Gas Daily" for

either Colorado Interstate Gas Company (CIG-N.syst.) or Northern

Natural Gas Company (Ventura), during the month following the

month of the transaction(s) creating the imbalance. For excess

receipt(s), the applicable index price shall be the lowest daily

price during the month following the month of the transaction(s)

creating the imbalance for either the CIG-N.syst. or the Ventura

index. For excess delivery(ies), the applicable index price shall

be the highest daily price during the month following the month of

the transaction(s) creating the imbalance for either the CIG-

N.syst. or the Ventura index.

(The rest of this sheet has been intentionally left blank.)