Centra Pipelines Minnesota Inc.

Second Revised Volume No. 2

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Effective Date: 10/16/1991, Docket: RP91-136-002, Status: Effective

Original Sheet No. 7 Original Sheet No. 7 : Effective

3.3 For any Authorized Overrun Volumes ("AOS"), the rate for

transportation service under this Rate Schedule shall be the AOS

rate set forth on currently effective Sheet No. 4.

3.4 Centra is entitled to seek a rate change at any time by filing with

the Commission pursuant to Section 3 of the Natural Gas Act.

4. Minimum Monthly Bill

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4.1 The minimum monthly bill shall be the demand charge for each

calendar month.

5. Contract Quantity

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5.1 Contract Quantity to be transported pursuant to this Rate

Schedule shall be specified in an executed Transportation Service

Agreement.