Puget Sound Energy, Inc.

Original Volume No. 1

Effective Date: 11/01/1998, Docket: CP98-250-002, Status: Effective

Original Sheet No. 15 Original Sheet No. 15 : Effective

1.23 Interruptible Working Gas Inventory

"Interruptible Working Gas Inventory" of an Owner means the

quantity of Working Gas Inventory of such Owner which is in excess

of the Firm Working Gas Capacity of such Owner.

1.24 Month

"Month" means a calendar month.

1.25 Monthly Activity

"Monthly Activity" of an each Owner means the absolute sum (i.e.,

not offset) of Daily Activity for each Day of such Month of such

Owner.

1.26 Northwest System Balancing

"Northwest System Balancing" means that part of Northwest's Daily

Activity including any use of Interruptible Working Gas Capacity

or of the Northwest System Balancing Account, which is not

attributable to Confirmed Nominations for injections and

withdrawals for storage and balancing-type services provided by

Northwest (or any Affiliate of Northwest) pursuant to Storage Gas

Service Agreements or other service agreements which are subject

to FERC approved rate schedules specifically established for such

services.

1.27 Northwest System Balancing Account

"Northwest System Balancing Account" means an account in which is

kept the cumulative balance, net of off-setting injections, of

Northwest's withdrawals of gas for Northwest System Balancing in

amounts which exceed Northwest's Available Working Gas Inventory.

Northwest System Balancing Account thus reflects, at any time, the

cumulative quantity of natural gas, if any, which Northwest has

borrowed from, on a nonfirm basis, the Storage Project for

Northwest System Balancing. Northwest System Balancing Account

shall be equal to or less than zero (0).