Associated Electric Cooperative Inc.

American Electric Power

Basin Electric Power Cooperative

Braintree Electric Light Department

Cinergy

Dominion Virginia Power

Florida Power & Light

Forsmark Kraftgrupp

Grand River Dam Authority

Hoosier Energy Rural Electric Cooperative, Inc.

Nebraska Public Power District NPPD

New Brunswick Power

NOK

OKG Aktiebolag, Sweden

Ontario Power Generation

PG&E - Pacific Gas and Electric Company

Pinnacle West Energy

Puerto Rico Electric Power Authority

SaskPower

Seminole Electric Cooperative, Inc.

Tucson Electric Power

Tennessee Valley Authority