Others often describe Ms. Ayres’ work as bridge building: making essential connections between companies and regulators, executive teams and investors, corporate leaders and stakeholders, competitors and allies, tradition and innovation. 

“I worked with Merribel when I was CEO at Enel North America. She and her team were strategic in making all the right connections for the company in Washington (and beyond). They supported presence and expansion into the US as a highly credible and respected company with investors, policymakers, business partners and stakeholders and the achievement of results in record time and with impressive impact!”

Toni VolpeToni Volpe
CEO Renantis
Former CEO & President Enel Green Power North America

“Merribel’s ability to quickly diagnose the central issues decision-makers must grapple with and to see through the thicket competing interests is indispensable when trying to move forward groundbreaking ideas.”

Letha TawneyLetha Tawney
Commissioner, Oregon PUC
Former executive at World Resources Institute

“I highly recommend Merribel Ayres. Her excellent insight and judgment based on her outstanding experience with major US and global organizations contributed significantly to the business and regulatory accomplishments of my company.”

Jacob J. WorenkleinJacob J. Worenklein
Chairman and CEO, US Power Generating Company and US Grid Company


Representative client list of prominent corporations, investment banks, insurance firms, trade associations, NGO’s and international organizations. 

US Corporate Clients

  • The AES Corporation
  • AIG Environmental
  • Alliance Pipeline, Ltd.
  • Alstom Power (GE)
  • American Electric Power
  • Beacon Group Energy Funds
  • Calpine Corporation
  • Cinergy Corporation
  • Coleman Powermate
  • Constellation Energy Group
  • Dominion Resources, Inc.
  • Duke Energy Corporation
  • Entergy Corporation
  • Exelon Intercontinental Group
  • JPMorgan Partners
  • Longhorn Partners Pipeline
  • Mirant
  • PacifiCorp
  • Pepco Holdings, Inc.
  • Phoenix Solutions Co.
  • Powerspan Corp.
  • Public Service Enterprise Group
  • SoftSwitching Technologies
  • US Power Generating Company
  • UTC Power (United Technologies Corp.)


  • US Climate Action Partnership*

International Companies

  • Ballard Power Systems (Canada)
  • Blossom Srl (Italy)
  • Electricite de France (France)
  • Enel North America (Italy)
  • ESB International (Ireland)
  • Global Environmental Facility/The World Bank
  • Hydro-Quebec (Canada)
  • La Scuola Olografia Italia SRL (Italy)
  • Ontario Power Generation, Inc. (Canada)
  • Powergen UK plc (England)
  • Tractebel, Inc. (Suez) (Belgium/France) World
  • Business Council on Sustainable Development (Switzerland)

State Government

  • New York Independent System Operator


  • American Farmland Trust
  • Bipartisan Policy Center
  • Environmental Defense Action Fund
  • National Commission on Energy Policy World Resources Institute

Trade Associations

  • Edison Electric Institute Institute for Electric Innovation (IEI)
  • Independent Petroleum Association of America
  • Interstate Natural Gas Association of America
  • National Electrical Manufacturers Association

*Lighthouse managed the political representation of this prominent coalition over a four-year period.

AES Corporation
Alstom Power
BP (British Petroleum)
Boston Scientific Corporation
Chrysler LLC
Dow Chemical Company
Duke Energy
Environmental Defense Fund
Exelon Corporation
Ford Motor Company
General Electric
General Motors Corporation

John Deere
Johnson & Johnson
Natural Resources Defense Council
NextEra Energy
NRG Energy
PepsiCo North America
Pew Center on Global Climate Change
PG&E Corporation
PNM Resources
Rio Tinto
Shell Oil Company
Siemens Corporation
The Nature Conservancy
Weyerhaeuser Company
World Resources Institute