Columbia Gas Transmission LLC

Third Revised Volume No. 1

Effective Date: 03/03/2009, Docket: RP09-340-000, Status: Effective

Original Sheet No. 348 Original Sheet No. 348

GENERAL TERMS AND CONDITIONS (Cont'd)

18.6 Imbalance Netting and Trading

(a) Definitions. For purposes of this Section 18.6, the following definitions shall be applicable:

(1) "Operational Impact Area" is the term used to describe Transporter's designation of

the largest possible area(s) on its system in which imbalances have a similar operational effect.

(2) "Netting" is the term used to describe the process of resolving imbalances for Shipper

within an Operational Impact Area. There are two types of Netting: (a) summing is the accumulation of

all imbalances above any applicable tolerances for Shipper or agent; and (b) offsetting is the

combination of positive or negative imbalances above any applicable tolerances for Shipper or agent.

(b) Month-end Imbalances.

(1) Transporter shall allow Shipper (including agents of Shipper) to net imbalances within

the same Operational Impact Area on and across service agreements with Shipper and to trade imbalances

within the same Operational Impact Area.

(2) Transporter shall provide Shippers the ability to post and trade imbalances until at

least the close of the seventeenth (17th) business day of the month.

(3) Transporter shall provide Shippers the ability to view and, upon request, download

posted imbalances.

(4) Imbalances to be posted for trading should be authorized by Shipper.

(5) Authorizations to post imbalances that are received by Transporter by 11:45 a.m.

(C.T.) should be effective by 8:00 a.m. (C.T.) the next business day. Imbalances previously authorized

for posting should be posted on or before the ninth (9th) business day of the month.

(6) Transporter is not required to post zero imbalances.

(7) Netting, posting, and trading of imbalances shall be accomplished based upon

Transporter's current method for accounting for imbalances and Transporter is not required to institute

daily imbalance procedures.

(8) Transporter shall enable the imbalance trading process by: receiving the Request for

Imbalance Trade, receiving the Imbalance Trade Confirmation, sending the Imbalance Trade Notification,

and reflecting the trade prior to or on the next monthly Shipper Imbalance.

(9) When trading imbalances, Shippers shall specify a quantity.

(10) Imbalance trades can only be withdrawn by the initiating trader and only prior to the

confirming trader's confirmation of the trade. Imbalance trades are considered final when confirmed by

the confirming trader and effectuated by Transporter.

(11) After receipt of an Imbalance Trade Confirmation, Transporter shall send the Imbalance

Trade Notification to the initiating trader and the confirming trader no later than twelve (12) noon

(C.T.) the next business day.

(12) To account for any imbalances after imbalance trading, where Transporter associates

such imbalance with a service agreement, Shipper and Transporter shall agree to designate one of

Shipper's valid service agreements in the Operational Impact Area where the original imbalance

occurred, for such purpose.