National Fuel Gas Supply Corporation

Fourth Revised Volume No. 1

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Effective Date: 04/21/2010, Docket: RP10-504-000, Status: Effective

Sixth Revised Sheet No. 91 Sixth Revised Sheet No. 91

Superseding: Fifth Revised Sheet No. 91

IAS RATE SCHEDULE

INTERRUPTIBLE ADVANCE SERVICE

2. APPLICABILITY AND CHARACTER OF SERVICE (Cont'd.)

2.3 Service hereunder shall consist of the advance of gas by

Transporter, up to the Maximum Advance Quantity specified in the

IAS Service Agreement, the delivery of such gas into

Transporter's transmission facilities for subsequent

transportation pursuant to the EFT, IT, FT, FST or FT-S Rate

Schedule, and the acceptance at the receipt point designated in

the IAS Service Agreement of the quantity advanced by Transporter

hereunder.

2.4 Shipper shall be required to return the sum of (i) the quantity

of gas advanced by Transporter from storage fields utilized by

Transporter, which quantity shall include quantities retained by

Transporter during the subsequent transportation of such gas by

Transporter, and (ii) a quantity of gas equal to the product

obtained by multiplying the quantity of gas described in clause

(i) hereof by two (2) times the sum of the percentages set forth

on Sheet No. 10 as "surface operating allowance" and "Storage

LAUF retention".

2.5 Shipper may nominate for the return of advanced gas at any time,

subject to Section 13 of the General Terms and Conditions of this

Tariff, and Transporter shall accept such gas to the extent it

has capacity to do so. The voluntary return of advanced gas

hereunder shall have a priority of service equal to service under

the IT Rate Schedule.

2.6 Upon receipt of notification from Transporter, Shipper must

return the quantities of gas specified in Section 2.4 hereof

within the period of time and according to the schedule specified

in Transporter's notification; provided, however, that such

period of time shall be at least forty-eight (48) hours.

2.7 Transporter shall not be required to receive or deliver gas at a

receipt or delivery point where the total quantity of gas for

transportation scheduled is less than that required to operate

existing measurement facilities at such point.

2.8 A Shipper receiving service under this IAS Rate Schedule shall

not lose priority for purposes of this Section by the renewal or

extension of term of that service.