PetroLogistics Natural Gas Storage LLC

Original Volume No. 1

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Effective Date: 06/03/2009, Docket: RP09-577-000, Status: Effective

Original Sheet No. 31 Original Sheet No. 31

RATE SCHEDULE IBTS

INTERRUPTIBLE IMBALANCE TRADING SERVICE

1. AVAILABILITY

This Rate Schedule is available to any Shipper for the purchase of interruptible natural gas

imbalance trading ("IBTS") service from PetroLogistics, provided that:

(a) PetroLogistics has determined that service requested by Shipper will not interfere with efficient

operation of its system or with higher priority services;

(b) Shipper and PetroLogistics have executed a Hub Services Agreement under this Rate Schedule;

(c) Shipper accepts responsibility for arranging any transportation service required for utilization

of the imbalance trading service provided under this Rate Schedule; and

(d) Service under this Rate Schedule may not be available to the extent that PetroLogistics would be

required to construct, modify, expand or acquire any facilities to enable PetroLogistics to perform the

requested services.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 This Rate Schedule shall apply to all IBTS service rendered by PetroLogistics to Shipper at

PetroLogistics' facilities located in Iberville Parish, Louisiana pursuant to an executed Hub Services

Agreement.

2.2 IBTS service rendered by PetroLogistics to Shipper under this Rate Schedule shall consist of the

trading of imbalance quantities by PetroLogistics for Shipper at agreed upon Point(s) of Receipt and

Delivery on PetroLogistics' system upon nomination by Shipper, and shall also permit the trading of

imbalance quantities among Shippers. PetroLogistics shall, on an interruptible basis, accept nominations

from Shipper for Point(s) of Receipt and Point(s) of Delivery located on PetroLogistics' system for

quantities of gas up to the quantities set forth in Exhibit B of Shipper's Hub Services Agreement, in

order to permit Shipper to trade imbalances created under Rate Schedules set forth in this FERC Gas

Tariff. Further, PetroLogistics, on an interruptible basis, shall permit Shipper with imbalance

quantities, upon prior notification to PetroLogistics, to trade such imbalance quantities with another

Shipper, up to the quantities set forth in Exhibit B of Shipper's Hub Services Agreement.

Shipper shall be permitted to combine the IBTS service available under this Rate Schedule with any

service available under any other Rate Schedule set forth in this FERC Gas Tariff; provided, however,

such combined services shall be subject to Section 7 of the General Terms and Conditions of this FERC

Gas Tariff; and, provided, further, that priority for each service shall be determined by the

respective priority of that service as set forth in Section 7 of the General Terms and Conditions of

this FERC Gas Tariff.

3. RATES AND CHARGES

The charges to be paid by Shipper shall be mutually agreed to by PetroLogistics and Shipper. The

rates and charges paid by Shipper for IBTS service under this Rate Schedule shall include the applicable

imbalance trading rate components set forth in the Rate Statement IBTS and as described below:

(a) Interruptible Imbalance Trading Charge. A charge for each Dth scheduled and confirmed with

PetroLogistics as an imbalance trade, including imbalance quantities traded between Shippers.

(b) Fuel Reimbursement. No fuel is required to perform PetroLogistics' imbalance trading service.