William M. Bumpers

Department Chair - Environmental (Washington) Partner


Washington, D.C.

P: +1.202.639.7718 F: +1.202.585.1008
Bill Bumpers Photo

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, climate change and energy policy issues. He has an active environmental regulatory, litigation and transactional practice, representing electric generating companies, petroleum refineries, cement manufacturers and investment companies. He has written and spoken extensively on new source review and prevention of significant deterioration issues under the Clean Air Act.

Mr. Bumpers is a leading authority on climate change issues. He has been involved with climate change issues for over thirty years. He represents a wide range of electric generating companies in connection with the U.S. EPA rule making under Sections 111(b) and (d) of the Clean Air Act. He has represented numerous companies involved with emission reduction projects in the United States pursuant to American Carbon Registry protocols, assisted with companies reporting under the Carbon Disclosure Project and has been involved in GHG-related transactions under the Clean Development Mechanism (CDM) 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 legal and regulatory framework for the carbon storage rights and validation protocols in the United States.

Related Experience

  • Coalition for Innovative Climate Solutions (“CICS”). CICS is a coalition of 13 major electric generating companies focused on constructive comments on EPA’s proposed Clean Power Plan to regulate GHG emissions from existing fossil fuel - fired electric generating units.
  • Represented a major electric generating company in challenging EPA’s federal implementation plan for regional haze in North Dakota.
  • Represented a major investor owned utility in negotiations with EPA to resolve dispute of federal implementation plan for a large power plant in New Mexico under EPA’s regional haze rules.
  • Represented largest generating plant in Montana in connection with citizen suit alleging violations of the prevention of significant deterioration provisions of the Clean Air Act.
  • Represent major electric utility in connection with regional haze regulations and citizen suit in Minnesota.
  • Represent multiple companies in connection with state and federal regional haze regulations in Montana, Arkansas, Texas, Minnesota, North Dakota, Oregon, Louisiana, and New Mexico.
  • Represented companies in defense of EPA and citizen enforcement of prevention of significant deterioration claims in numerous states, including New York, Louisiana, Colorado, Montana, Maryland and Kentucky.
  • Represented three major petroleum refineries in negotiations against EPA to resolve all allegations of Clean Air Act violations against their refineries (16 total refineries) involving new source review, new source performance standards and BWON and LDAR requirements.
  • Represent major cement manufacturers in response to Section 114 investigation and defend against Clean Air Act claims brought by EPA alleging PSD violations. 

Awards & Community

Listed in Chambers USA, 2004-2018 and Chambers Global, 2010-2018

Listed in The Best Lawyers in America 2005-2018

Recognized as a Washington D.C. Super Lawyer, 2007, 2009, 2010, 2013, 2014, 2015, 2017 & 2018


Publications, Speeches & Presentations



Cross-Cutting Issues Group Semi-Annual Meeting

Baker Botts lawyers host this semi-annual meeting consisting of a group of electric generating companies to discuss key developments, network with key contacts, and leverage relationships in the power sector.