Marc Campopiano has extensive experience in obtaining governmental approvals and ensuring environmental compliance for major energy, infrastructure, and land use matters. Mr. Campopiano has particular expertise with matters involving complex climate change, air quality, and land use issues. He represents real estate developers, energy companies, and utilities on a range of projects, including major residential and commercial development, renewable and traditional power generation, transmission lines, gas storage facilities, and cleantech development.

Mr. Campopiano parlays his strong environmental background with legal experience to deliver specialized representation on matters where technical and legal issues can be closely intertwined. He has a Masters of Environmental Science and Management and previously worked as an environmental consultant evaluating power plants, transmission lines, and other major projects under the California Environmental Quality Act (CEQA) and the National Environmental Policy Act (NEPA).

Mr. Campopiano has particular experience in matters related to energy, climate change, land use, air quality, health risk assessments, and biological impacts. He frequently advises clients on requirements under the Endangered Species Act, Migratory Bird Treaty Act, National Historic Preservation Act, Clean Air Act, and Clean Water Act.

Mr. Campopiano formerly served as Local Chair of the Environment, Land & Resources Department in the Orange County office.

Mr. Campopiano’s representative matters include the following:

  • Represented Newhall Land and Farming Company with CEQA approvals from the California Department of Fish and Wildlife, California Air Resources Board, and County of Los Angeles as the first-ever large “net zero GHG” master-planned community in California, including developing ground-breaking strategies to mitigate climate impacts and to meet net zero energy standards
  • Counseled Southern California Edison on the West Devers Transmission Line Project before the California Public Utilities Commission and Bureau of Land Management to facilitate the interconnection of renewable generation, including obtaining approvals under the Endangered Species Act and Clean Water Act
  • Represented SoCalGas with regulatory actions related to the Aliso Canyon natural gas leak, including matters before the California Public Utilities Commission and the Division of Oil, Gas and Geothermal Resources
  • Represented NRG Energy with regard to its Puente Power Project before the California Energy Commission, integrating renewable sources and maintaining grid reliability
  • Represent Stanton Energy Reliability Center before the California Public Utilities Commission and in litigation before the Court of Appeal
  • Represented Hyperloop One with obtaining approval from the Bureau of Land Management to construct the first-ever full scale “hyperloop” test track on federal land in Nevada
  • Successfully represented CPV Sentinel LLC before the Ninth Circuit in defense of a lawsuit seeking to overturn the US Environmental Protection Agency’s approval of emission credits for its US$1 billion power plant
  • Assisted major power producer with participating in a state rulemaking process to implement regulations under Section 316(b) of the federal Clean Water Act
  • Represented large wind farm with first out-of-country certification by the California Energy Commission under California’s Renewables Portfolio Standard (RPS)

Thought Leadership

  • Co-Author, “California Supreme Court Clarifies Standards for Judicial Review and Air Quality Analyses” Latham & Watkins Client Alert, March 6, 2019
  • Co-Author, “California Supreme Court: Government Communications on Private Accounts Are Public,” Latham & Watkins Client Alert, March 16, 2017
  • Co-Author, Latham & Watkins Global Energy and Climate Update, June 22, 2016
  • Co-Author “Rapidly Transforming Energy Section: Risks and Opportunities in the US, China and Europe,” Bloomberg BNA International Environment Reporter, December 16, 2015
  • Co-Author, “Proposed Rule from U.S. Department of the Interior Increases Pressure on Coal Mining Industry,” Pratt’s Energy Law Report, November 1, 2015
  • Co-Author, “Can Calif.’s Gov. Still hit His Climate Change Goals?” Law360, October 6, 2015
  • Co-Author, “EPA Finalizes Historic Greenhouse Gs Emission Reduction Program,” Latham & Watkins Client Alert White Paper, August 18, 2015
  • Co-Author, “California Energy Conservation Plan Hits Speed Bump,” Law360, April 6, 2015
  • Mr. Campopiano is a regular contributor to the firm's Clean Energy Report Blog at

Speaking Engagements

  • The Economics, Future & Opportunity of ESG Platforms for Global to Local Sustainability & Success, Sustain Southern California, September 2021
  • North American Carbon World 2021 Virtual Conference, “The Winding Road to Net Zero: A Workshop on Legal Issues Critical to Decarbonization,” April 22, 2021
  • When is it Defensible to Mitigate CEQA GHG Emissions Impacts with GHG Credits? AEP Conference, Monterey, March 2019
  • Addressing GHG Emissions under CEQA: Recent Developments and Trends for 2019, North American Carbon World Conference, Los Angeles, April 2019

Bar Qualification

  • California


  • JD, University of California, Berkeley, School of Law, 2006
  • Masters of Environmental Science and Management, University of California, Santa Barbara, 2000
  • BA, University of California, Los Angeles, 1997
    cum laude
General Recognition Thumbnail
March 26, 2018Recognition

2018 CLAY Awards: Net Zero Newhall

A Latham environmental team advising the Newhall Ranch community is honored as Attorneys of the Year for innovative work in advancing one of the largest master-planned communities ever proposed in California.