National Fuel Gas Supply Corporation

Third Revised Volume No. 1

Effective Date: 04/01/1997, Docket: RP97-201-000, Status: Effective

Second Revised Sheet No. 77 Second Revised Sheet No. 77 : Superseded

Superseding: First Revised Sheet No. 77

IAS RATE SCHEDULE

INTERRUPTIBLE ADVANCE SERVICE

1. AVAILABILITY

1.1 This IAS Rate Schedule is available for interruptible advance

service by National Fuel Gas Supply Corporation (hereinafter called

"Transporter") on behalf of any person (hereinafter called "Ship-

per") to the extent that: (i) excess deliverability is available

from storage fields utilized by Transporter, as determined by

Transporter in its sole discretion from time to time; (ii) Shipper

makes a request for service as set forth in Section 31 of the

General Terms and Conditions and executes a service agreement for

interruptible advance service under this IAS Rate Schedule in the

form contained in this Tariff; (iii) Shipper has arranged for the

transportation of the gas to be advanced by Transporter hereunder

from storage fields utilized by Transporter to the desired delivery

points under the EFT, IT or FT Rate Schedules; and (iv) such

service complies with the terms and conditions of this IAS Rate

Schedule.

1.2 In addition to the information specified in Section 31 of the

General Terms and Conditions, a request for service under this rate

schedule shall include the following:

(a) Gas Quantities: The Maximum Advance Quantity requested,

stated in dekatherms.

(b) Receipt Point(s): The designated Receipt Point(s) for the

return hereunder of gas service.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 (a) Service hereunder shall be provided on an interruptible basis.

Interruption of service includes decreasing, suspending, or

discontinuing the delivery of gas.

(b) Service hereunder shall be interrupted whenever necessary to

permit Transporter to meet its obligations under firm trans-

portation or firm storage rate schedules.