Iroquois Gas Transmission System, L.P.

FIRST REVISED VOLUME NO. 1

Effective Date: 08/01/1999, Docket: RP99-411-000, Status: Effective

Third Revised Sheet No. 57B Third Revised Sheet No. 57B : Effective

Superseding: Second Revised Sheet No. 57B

Specifically, Shippers should have the ability to nominate for

several days, months, or years, provided the nomination begin

and end dates are within the term of Shipper's contract.

The standard quantity for nominations, confirmation and

scheduling is dekatherms per gas day in the United States,

gigajoules per gas day in Canada and gigacalories per gas day in

Mexico. (For reference 1 dekatherm = 1,000,000 Btu's; 1

gigajoule = 1,000,000,000 joules; and 1 gigacalorie =

1,000,000,000 calories.) For commercial purposes, the standard

conversion factor between dekatherms and gigajoules is 1.055056

gigajoules per dekatherm and between dekatherms and gigacalories

is 0.251996 gigacalories per dekatherm. The standard Btu is the

International Btu, which is also called the Btu(IT); the standard

joule is the joule specified in the SI system of units.

4.2 Allocation of Capacity. On each day

Transporter shall determine with respect to all contracts:

(a) the total quantities which all Shippers

have nominated to be received for

transportation service on that day;

(b) the total quantities which all Shippers

have nominated to be delivered for

transportation service on that day;

reserved for unscheduled imbalances with point

operators receiving service under Operational

Balancing Agreements ("OBAs");

(d) the total quantities which all Shippers have

nominated to be parked and loaned on that day;

and

(e) Transporter's system capacity available in

each pipeline segment to perform all of the

requires services.

When allocating capacity, the transportation priority for

fuel will be the same as the level of service as the transaction

to which it applies.