Alcoa

Alliance Mezzanine Investors

Alstom

American Securities Capital Partners

ARC Financial

ArcLight Capital Partners

Barclays Capital Commodities Principal Investments

Black Stone Minerals Company

Borealis Infrastructure

BP

CAM Energy

Catalytica Energy Systems

Chaparral Energy

Competitive Power Ventures

Dynamis Advisors

Electro Energy

Energy Automation Systems

Energy Investors Funds

Energy Source Canada

First Reserve

General Electric

Graham Partners

Hastings Funds Management USA

Hunt Power

Ironwood Equity

Lehman Brothers

Long & Company

MAP-Global/Interpublic

Mobius Risk Group

Morgan Stanley

NGP Energy Capital Management

NGP Midstream & Resources

Noble Royalties, Inc.

NZ Legacy

Pratt & Whitney

PSEG Services

Ridgewood Renewable Power

Riverstone Holdings

Schlumberger Information Solutions

Silver Point Capital

Southern Company

Spark Energy Gas

Sustainable Wealth Management

The Conti Group

US Energy Systems

VAALCO Energy

Warburg Pincus