Puget Sound Energy, Inc.

Original Volume No. 1

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

Original Sheet No. 84 Original Sheet No. 84 : Effective

Exhibit C

(dated January 15, 1998)

to the

Jackson Prairie

Gas Storage Project Agreement

Certificated Characteristics and Capabilities

Characteristics and Capabilities of the Jackson Prairie Storage

Project for the 1997-1998 Storage Cycle and thereafter:

Project Cushion Gas:

Zone 2 Not less than 17.2 Bcf

Zone 9 Not less than 2.0 Bcf

Project Working Gas Capacity:

Zone 2 Not more than 15.1 Bcf

Project Total Storage Gas Capacity:

Zone 2 Not more than 34.4 Bcf

Project Firm Withdrawal Deliverability: Not more than 550,000 Mcf

Daily

Project Best Efforts Deliverability: Up to 71,800 Mcf Daily