ENSTOR Announces Open Season for Houston Storage Hub Firm Service

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August 18, 2004

ENSTOR, a unit of ScottishPower's PPM Energy Inc., will begin accepting bids immediately for firm storage capacity at its proposed Houston Storage Hub. Non-binding bids are due by 5:00 p.m. CST on Sept. 17, 2004. All parties meeting the minimum threshold bid will be contacted to further negotiate contract specifics by Oct. 1, 2004.

ENSTOR's Houston Storage Hub is proposed to interconnect with 7 interstate and intrastate pipelines and provide firm storage services of approximately 10 annual cycles. Total working storage capacity would be 18 Bcf upon completion of this facility and have a maximum daily deliverability of 1,500,000 MMBtu/d. The ENSTOR Houston Storage Hub could also be utilized as a header system allowing customers to capture value between the various pipeline locations.

Parties interested in bidding for firm storage at the Houston Storage Hub should contact Patrick DeVille at (281) 374-3053 for further information or visit www.enstorinc.com. All bids over the minimum threshold will be considered for final awarding.

Art Sasse, Director, Communications & Brand, Iberdrola Renewables, 503-796-7740
Paul Copleman, Media Relations, Iberdrola Renewables, 207-641-2805