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Andrew C. Lillie


Andrew C. Lillie

Andrew Lillie manages our Litigation Practice in the Denver office. He is a commercial litigator and regulatory attorney who focuses on energy and natural resources businesses and related commercial and environmental litigation, regulation, and compliance. He counsels clients on issues related to commercial disputes, permitting, toxic torts, land use, air quality, water quality, hazardous waste, and climate change.

He litigates in state and federal courts and before administrative agencies. He also defends his clients in business disputes, agency enforcement actions, and citizen suits. He handles administrative-law disputes, FOIA issues, electronic-information and privacy problems, healthcare-fraud cases, and internal investigations as well.

Andrew works primarily in the electricity-generation, oil and gas, gold and hard-rock mining, wind, solar, and coal sectors. He also provides support to non-natural-resources clients, such as businesses, governmental agencies, and ski areas, on commercial disputes, governmental/regulatory permitting, and enforcement issues.

Andrew's notable experience with natural resources and environmental matters includes citizen suits and enforcement matters involving the Clean Air Act (CAA), the Clean Water Act (CWA), the National Environmental Policy Act (NEPA), the Endangered Species Act (ESA), the Federal Land Policy and Management Act (FLPMA), and other federal statutes. He also regularly handles issues related to state and common-law public-health, oil and gas, eminent-domain, land-use, real estate, public-contracting-bidding, and permitting disputes. He has also served as a Special Assistant Attorney General for Colorado agencies, and was a law clerk for Chief Judge Lewis T. Babcock of the United States District Court for the District of Colorado.

"The last time we hired Hogan Lovells to do work for us, I specifically called Andy because of my very positive prior experience in working with him on other matters. . . . I chose to call Andy [because] in working on highly complex and difficult legal issues, I have always found Andy to be thoughtful in his approach, thorough in his analysis, and — most importantly — helpful in his advice."

Mike Jenkins, PacifiCorp Energy

Representative Experience

Won jury trial for AngloGold Ashanti in contract dispute in which client was awarded ownership of gold mine worth approximately US$100m.

Representing Antero Resources in one of the nation's first oil and gas hydrofracking toxic tort lawsuits.

Represented Colorado's College Assist in dispute brought by former contractor over bid for 10-year, multi-million-dollar contract.

Won Endangered Species Act and NEPA lawsuit in California for wind client worth approximately US$500m.

Defended Xcel's Comanche III coal-fired power plant permit and won in state court.

Assist various ski areas with their federal permitting issues and against federal enforcement actions.

Represented and favorably settled Colorado State Land Board in contract dispute over US$100m water-provision issue.

Defended and favorably settled NV Energy's Reid Gardner power plant against Sierra Club citizen suit.

Education and admissions


  • J.D., Order of St. Ives, University of Denver Sturm College of Law, 2002
  • M.A., University of Colorado, 2002
  • B.G.S., University of Michigan College of Literature, Science, and the Arts, 1994
  • B.S., with distinction, University of Michigan School of Natural Resources and Environment, 1994


  • Former Board of Directors, Colorado Photographic Arts Center
  • Former Board of Directors, Institute for Environmental Solutions
  • Member, American Bar Association
  • Member, Colorado Bar Association
  • Member, Downtown Denver Leadership Program

Bar admissions and qualifications

  • Colorado
  • Michigan
  • North Dakota

Court admissions

  • U.S. Court of Appeals, Eighth Circuit
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. Court of Appeals, Tenth Circuit
  • U.S. District Court, District of Colorado


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