Great Lakes Gas Transmission Limited Partner

Second Revised Volume No. 1

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Effective Date: 04/27/2001, Docket: RP01-272-000, Status: Effective

Second Revised Sheet No. 63E Second Revised Sheet No. 63E : Effective

Superseding: First Revised Sheet No. 63E

RATE SCHEDULE MC

MARKET CENTER SERVICES

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(continued)

4. RATES AND CHARGES

4.1 Rates

The maximum and minimum rates for services under this Rate Schedule MC are listed on Sheet 5A of

Transporter's FERC Gas Tariff, Second Revised Volume No. 1. Transporter may adjust, in its sole

discretion, and not on an unduly discriminatory basis, any or all of the rates posted and/or

charged for any day. Except as permitted by Section 4.5, Negotiated Rates, the adjusted rate(s)

shall not exceed the applicable maximum rate(s), nor shall they be less than the minimum

rate(s), set forth on Sheet No. 5A. Transporter shall have the right to charge the maximum rate

at any time as a condition for new service or for continuation of service under an existing

Agreement, unless otherwise provided by the Agreement.

By 8:00 a.m. (C.C.T.) on the Day prior to Gas flow (i.e, the Day on which nominations are due

pursuant to Subsection 3.2 of this FERC Gas Tariff), Transporter shall post on its Web Site the

rates to be charged on the Day that service is to be performed by Transporter under this Rate

Schedule MC. Once Shipper has entered into a MC Service Agreement, Shipper's nomination for

service under this Rate Schedule MC shall evidence Shipper's acceptance of the posted rate(s)

for the service being nominated.

4.2 Park and Loan Charges

(A) The monthly charges for Parking Service shall be the sum of the following:

(1) The product of (a) the quantities of Gas received by Transporter on any Day during the

Month that Gas is received for Parking Service and (b) the applicable First Day Fee as

posted on Transporter's Web Site for the appropriate Day(s); and

(2) the product of (a) the quantities of Gas parked on Transporter's system on each Day of

the Month, excluding the days on which Shipper parks and subsequently removes such Gas

from Transporter's system, and (b) the applicable Subsequent Day Fee as posted on

Transporter's Web Site for the appropriate Day(s).

(B) The monthly charges for Loan Service shall be the sum of the following:

(1) The product of (a) the quantities of Gas loaned to Shipper by Transporter on any Day

during the Month that Gas is loaned to Shipper for Loan Service and (b) the applicable

First Day Fee as posted on Transporter's Web Site for the appropriate Day(s); and

(2) the product of (a) the quantities of loaned Gas retained by Shipper on each Day of the

Month, excluding the days on which Shipper is first loaned such Gas and subsequently

returns it, and (b) the applicable Subsequent Day Fee as posted on Transporter's Web

Site for the appropriate Day(s).

(C) If on a given Day Transporter is unable to schedule a Shipper's nomination that would have

reduced Shipper's outstanding Park and/or Loan balance on a given day, solely for the

purpose of assessing a Subsequent Day charge under Subsections 4.2(A)(2) and/or 4.2(B)(2)

above, Shipper shall not be charged a Subsequent Day fee for the quantity of Gas

Transporter was unable to schedule in response to Shipper's nomination.

4.3 Title Transfer Tracking Service Charge

There is currently no charge for this service. However, Transporter reserves its right to

charge for this service in the future upon the approval of the Federal Energy Regulatory

Commission.