NYSE Energy Stock

Enersis S.a.

Harvest Energy Trust

Petrochina Company Ltd.

Enerplus Resources Fund

Korea Electric Power Corporation

Precision Drilling Corporation

Advantage Energy, Income Fund Trust Unit

Integrys Energy Group, Inc.

For purposes of this Annual Report on Form 10-K, unless the context otherwise indicates, when we refer to "us," "we," "our" or "ours," we are describing Integrys Energy Group, Inc. more

Eni S.p.a.

Primewest Energy Trust

Duquesne Light Holdings, Inc.

Cnooc

Endesa S.a.

Huaneng Power International, Inc.

Semco Energy, Inc.