Puget Sound Energy, Inc.

Original Volume No. 1

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Effective Date: 11/01/1999, Docket: CP98-250-003, Status: Effective

Original Sheet No. 91 Original Sheet No. 91 : Effective

Exhibit C

(dated January 16, 1998)

to the

Jackson Prairie

Gas Storage Project Agreement

Certificated Characteristics and Capabilities

Characteristics and Capabilities of the Jackson Prairie Storage Project for the 1999-2000 Storage Cycle and thereafter:

Project Cushion Gas Requirement Not less than 19.0 Bcf

Zone 2 Not less than 15.0 Bcf

Zone 9 Not less than 4.0 Bcf

Project Working Gas Capacity Not more than 18.3 Bcf

Zone 2 Not more than 17.3 Bcf

Zone 9 Not less than 1.0 Bcf

Project Gas Capacity Not more than 39.4 Bcf

Zone 2 Not more than 34.4 Bcf

Zone 9 Not more than 5.0 Bcf

Project Firm Withdrawal Deliverability Not more than 850,000 Mcf Daily

Project Best Efforts Deliverability Not more than 150,000 Mcf Daily