Education and Honors

  • J.D., University of Virginia School of Law, 1984
    Editor in Chief, Virginia Journal of Natural Resources Law
  • M.A., economics, Antioch University, 1979
  • B.A., economics, Hendrix College, 1977
  • Listed in Chambers USA, 2004-2014 and Chambers Global, 2010-2014

    Listed in The Best Lawyers in America 2005-2013

    Recognized as a Washington D.C. Super Lawyer, 2007, 2009, 2010, 2013 & 2014

Admissions and Affiliations

District of Columbia Bar

United States Courts of Appeals for the Second, Fourth, Fifth and District of Columbia Circuits

American Bar Association, Section on Energy and Environmental Resources

William M. Bumpers


The Warner
1299 Pennsylvania Ave., NW
Washington, D.C. 20004-2400
United States


Environmental compliance and litigation; climate change transactions; permitting


Bill Bumpers is an environmental partner in the Washington, D.C., office and heads the firm’s global Climate Change Practice. Mr. Bumpers focuses on the Clean Air Act and climate change issues. He has an active environmental regulatory, litigation and transactional practice, representing electric generating companies, petroleum refineries, investment companies, electric generators and pharmaceutical and chemical manufacturers. He is regarded as a national authority on new source review issues affecting the electric generation and petroleum refinery industries. He previously served on the EPA’s New Source Review Reform Subcommittee of the Clean Air Act Advisory Committee. He has written and spoken extensively on new source review and prevention of significant deterioration issues under the Clean Air Act.

Mr. Bumpers also is a leading authority on climate change issues, including carbon trading mechanisms in the United States and internationally pursuant to the Kyoto Protocol. He has been involved with climate change issues since his work on energy policy and climate change as a graduate student in 1977. He represents companies involved with emission reduction projects in the United States pursuant to Climate Action Registry and American Carbon Registry protocols, as well as related CRT and emission reduction credit transactions. He has been involved in transactions involving Clean Development Mechanism (CDM) projects or Certified Emission Reduction (CER) sales in Malaysia, Indonesia, China, Liberia and Equatorial Guinea. He also represents companies involved in the capture and storage of GHG emissions and has helped pioneer the creation and sale of carbon storage rights in the United States. Mr. Bumpers also represents a wide range of companies on developing policy and regulatory issues in the United States and regarding the creation and sale of GHG legislative and regulatory policies in the United States.

Representative Engagements

  • Noble Energy-representation of Noble Energy in connection with the transfer and sale of CERs from a proposed Clean Development Mechanism Project in Equatorial Guinea
  • International Carbon Corporation-negotiations for exclusive right to develop CDM projects at palm oil mills in Malaysia and assist with the development of project design document under the CDM
  • ChevronTexaco-negotiations with the EPA to resolve global environmental claims against CTX’s five domestic refineries
  • Mirant Energy-representation on Clean Air Act compliance and enforcement matters
  • XCEL Energy Inc.-representation as XCEL’s national Clean Air Act counsel for compliance and permitting
  • NRG Energy Inc.-representation regarding allegations against NRG involving new source review and Title V provisions of the Clean Air Act (State of New York v. Niagara Mohawk Power Corp. (02-CV-24S, WD NY 2003))
  • Marathon Ashland Petroleum (MAP)-negotiations with the EPA to resolve allegations of Clean Air Act violations involving new source review, new source performance standards and BWON and LDAR requirements
  • International Finance Corporation-representation in connection with $15 million of certified emission reductions pursuant to the Clean Development Mechanism of the Kyoto Protocol