Andrew C. Lillie

Andrew C. Lillie


Email andrew.lillie@​

Phone +1 303 899 7339

Fax +1 303 899 7333

Practice groupLitigation, Arbitration, and Employment

Andrew Lillie manages our Litigation practice in the Denver office and helps clients solve their problems so they can focus on their businesses rather than legal issues.

He is a dispute resolution specialist and regulatory lawyer who focuses on energy and natural resources businesses and related commercial and environmental litigation, regulation, and compliance. He counsels clients on issues related to business and commercial disputes and dispute prevention, permitting, toxic torts, land use, air quality, water quality, hazardous waste, and climate change.

Part and parcel with his natural resources focus, Andrew works primarily in the electricity generation, oil and gas, gold and hard-rock mining, wind, solar, and utilities sectors.

Andrew also advises and defends non-natural resources clients, such as growing restaurant and real estate development businesses, governmental agencies, and ski areas, on contract and tort disputes, governmental/regulatory permitting, cybersecurity and privacy concerns, and enforcement issues.

Andrew's notable experience with natural resources and environmental matters includes defending clients against citizen suits and enforcement efforts 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), the Resource Conservation and Recovery Act (RCRA), 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, policy shaping, and permitting disputes. He has served as a Special Assistant Attorney General for Colorado agencies, and he was a law clerk for Chief Judge Lewis T. Babcock of the U.S. 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

Awards and recognitions


Environmental Litigation, Rising Stars
Colorado Super Lawyers

Education and admissions


J.D., University of Denver Sturm College of Law, Order of St. Ives, 2002

M.A. Science Journalism, University of Colorado, 2002

B.G.S., University of Michigan College of Literature, Science, and the Arts, 1994

B.S., University of Michigan School of Natural Resources and Environment, with distinction, 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

Vice Chair, American Bar Association Energy and Natural Resources Litigation Committee

Member, World Association of Mining Lawyers

Bar admissions and qualifications



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

Related Knowledge


Representative experience

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

Represented Antero Resources in one of the nation’s first oil-and-gas hydrofracturing 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 Energy's Comanche III coal-fired power plant permit and won in state court.

Assists 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.

Helps grow innovative, market-disrupting, forward-focused restaurant and real-estate-development businesses.

Latest thinking and events

Published Works

The New Energy Economy ColoradoBiz Magazine

Sponsorships and Speaking Engagements

USA and the Trump Administration: Changes to Mining Law and Policy and Their Impacts, World Initiative of Mining Lawyers Annual Meeting, Sinatra, Portugal

Sponsorships and Speaking Engagements

Going Beyond Party Discovery: Third Party Discovery, Subpoena, and Other Special Issues (Entry to Land, Inspection of Items, Medical Exams)

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