Iroquois Gas Transmission System, L.P.

FIRST REVISED VOLUME NO. 1

Effective Date: 08/31/1998, Docket: RP97-126-009, Status: Effective

Fifth Revised Sheet No. 49 Fifth Revised Sheet No. 49 : Effective

Superseding: Sub. Fourth Revised Sheet No. 49

Transporter shall use the applicable Measurement Variance/Fuel

Use Factor to adjust a Shippers Equivalent Quantity, up to

the Maximum Equivalent Quantity, or to calculate the

Measurement Variance/Fuel Use Quantity that a Shipper may

tender at the Applicable Receipt Point in lieu of an adjustment

to the Equivalent Quantity. A positive Measurement Variance/

Fuel Use Factor represents a loss in Transporter's Measurement

Variance/Fuel Use. A negative Measurement Variance/Fuel Use

Factor represents a net gain in Transporter's Measurement

Variance/Fuel Use. As provided by the formula for

calculating the Measurement Variance/Fuel Use Factor,

different Measurement Variance/Fuel Use Factors will be

applied to Transportation within Zone 1 and Zone 2 and for

backhauls.

Where a negative Measurement Variance/Fuel Use Factor exists,

additional units of gas associated with such negative

Measurement Variance/Fuel Use Factor which are within the

Shipper's Maximum Equivalent Quantity can be transported using

the commodity rate under Transporter's RTS Rate Schedule. If

the additional units of gas associated with such negative

Measurement Variance/Fuel Use Factor exceed the Shipper's

Maximum Equivalent Quantity, those additional units may be

transported under the ITS Rate Schedule at a rate up to the

maximum rate for such service on the currently effective

Sheet No. 4 of this FERC Gas Tariff.

Transporter shall file with the Commission by January 1 and

July 1 of each year, the calculation supporting the Measurement

Variance/Fuel Use Factors that were charged in each of the

preceding six months. Transporter may adjust the minimum or

maximum percentages set forth on Sheet No. 4 of this First

Revised Volume No. 1 from time to time based upon Transporter's

determination of changes in its Measurement Variance Fuel/Use

requirements.