No. 25-170
 
Title: Suncor Energy (U.S.A.) Inc., et al., Petitioners
v.
County Commissioners of Boulder County, et al.
Docketed: August 12, 2025
Lower Ct: Supreme Court of Colorado
   Case Numbers: (2025 CO 21)
   Decision Date: May 12, 2025
Questions Presented
 
Proceedings and Orders
Aug 08 2025 Petition for a writ of certiorari filed. (Response due September 11, 2025)
Petition Appendix Certificate of Word Count Proof of Service
Aug 28 2025 Waiver of right of respondent Cty. Comm'rs of Boulder Cty., et al. to respond filed.
Main Document
Sep 03 2025 DISTRIBUTED for Conference of 9/29/2025.
Sep 04 2025 Letter received from Suncor Energy (U.S.A.) Inc., et al.
Main Document
Sep 05 2025 Brief amici curiae of General (Retired) Richard B. Myers, et al. filed.
Main Document Proof of Service Certificate of Word Count
Sep 09 2025 Response Requested. (Due October 9, 2025)
Sep 11 2025 Brief amici curiae of Frontier Institute, et al. filed.
Main Document Proof of Service Certificate of Word Count
Sep 11 2025 Brief amicus curiae of United States filed.
Main Document Proof of Service
Sep 11 2025 Brief amici curiae of Atlantic Legal Foundation, et al. filed.
Main Document Certificate of Word Count Proof of Service
Sep 11 2025 Brief amici curiae of Professor Richard Epstein, et al. filed.
Main Document Proof of Service Certificate of Word Count
Sep 12 2025 Brief amicus curiae of American Tort Reform Association filed.
Main Document Proof of Service Certificate of Word Count
Sep 15 2025 Brief amicus curiae of American Petroleum Institute filed.
Main Document Proof of Service Certificate of Word Count
Sep 24 2025 Motion to extend the time to file a response from October 9, 2025 to November 10, 2025, submitted to The Clerk.
Main Document
Sep 25 2025 Motion to extend the time to file a response is granted and the time is extended to and including November 10, 2025.
Sep 26 2025 Brief amici curiae of Alabama, et al. filed.
Main Document Certificate of Word Count Proof of Service
Oct 09 2025 Brief amicus curiae of Professor Jason Johnston filed.
Main Document Proof of Service Certificate of Word Count
Oct 09 2025 Brief amici curiae of House Majority Leader Steve Scalise, et al. filed.
Main Document Proof of Service Certificate of Word Count
Oct 09 2025 Brief amicus curiae of National Association of Manufacturers filed.
Main Document Proof of Service Certificate of Word Count
Oct 09 2025 Brief amicus curiae of Chamber of Commerce of the United States of America filed.
Main Document Proof of Service Certificate of Word Count
Nov 10 2025 Brief of respondents County Commissioners of Boulder County, et al. in opposition filed.
Main Document Proof of Service Certificate of Word Count
Nov 25 2025 DISTRIBUTED for Conference of 12/12/2025.
Nov 25 2025 Reply of petitioners Suncor Energy (U.S.A.) Inc., et al. filed. (Distributed)
Main Document Certificate of Word Count Proof of Service
Jan 05 2026 DISTRIBUTED for Conference of 1/9/2026.
Jan 12 2026 DISTRIBUTED for Conference of 1/16/2026.
Jan 20 2026 DISTRIBUTED for Conference of 1/23/2026.
Feb 13 2026 DISTRIBUTED for Conference of 2/20/2026.
Feb 23 2026 Petition GRANTED. In addition to the question presented by the petition, the parties are directed to brief and argue the following question: Whether this Court has statutory and Article III jurisdiction to hear this case.
Feb 27 2026 Motion for an extension of time to file the briefs on the merits filed.
Main Document
Mar 11 2026 Motion to extend the time to file the briefs on the merits granted. The time to file the joint appendix and petitioners' brief on the merits is extended to and including May 14, 2026. The time to file respondents' brief on the merits is extended to and including July 27, 2026.
May 14 2026 Brief of petitioners Suncor Energy (U.S.A.) Inc., et al. filed.
Main Document Certificate of Word Count Proof of Service
May 14 2026 Joint appendix filed. (Statement of costs filed)
Main Document Proof of Service
May 15 2026 Brief amici curiae of The Pelican Institute For Public Policy, et al. filed.
Main Document Certificate of Word Count Proof of Service
May 18 2026 Brief amicus curiae of Atlantic Legal Foundation, et al. filed. (Distributed)
Main Document Certificate of Word Count Proof of Service
May 19 2026 Brief amicus curiae of American Tort Reform Association filed.
Main Document Certificate of Word Count Proof of Service
May 19 2026 Brief amici curiae of Frontier Institute, et al. filed.
Main Document Certificate of Word Count Proof of Service
May 20 2026 Brief amicus curiae of Center for Environmental Accountability filed.
Main Document Certificate of Word Count Proof of Service
May 20 2026 Amicus brief of Pacific Legal Foundation submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Professor Jason Johnston not accepted for filing. (May 21, 2026) (efiled with incorrect amicus party - brief to be refiled with correct amicus party)
May 21 2026 Amicus brief of Former State Solicitors General submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of The Buckeye Institute submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Washington Legal Foundation, National Federation of Independent Business Small Business Legal Center, Inc., National Association of Wholesaler-Distributors submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Breakthrough Institute submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Professor Derek T. Muller submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Former State Supreme Court Justices submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of CTIA-The Wireless Association submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of American Property Casualty Insurance Association, Complex Insurance Claims Litigation Association, and Reinsurance Association of America submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Consumers' Research submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Senators Ted Cruz, Chuck Grassley, Mike Lee, and Ted Budd submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Associated Governments of Northwest Colorado, Archuleta County, Delta County, Grand County, Garfield County, Mesa County, Montezuma County, Montrose County, and Rio Blanco County submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Professor Richard Epstein and Professor John Yoo submitted.
Certificate of Word Count Proof of Service Main Document
May 21 2026 Amicus brief of American Petroleum Institute submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of Center for Individual Rights submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of General (Retired) Richard B. Myers and Admiral (Retired) Michael G. Mullen submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of State of Tennessee submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of State of Alabama and 25 Other States submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of The Chamber of Commerce of the United States of America submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Professor Jason Johnston submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of The National Association of Manufacturers submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of Senior Foreign Affairs Officials Michael R. Pompeo, James Addison Baker III, Nikki Haley, and Herbert R. McMaster submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of Advancing American Freedom submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Protect the First Foundation submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Multinational energy, transportation, and manufacturing companies submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Save Our States submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Government Accountability & Oversight submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of American Free Enterprise Chamber of Commerce submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Neutral Principles submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Coalition of Large Tribes submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of United States submitted.
Main Document Proof of Service
May 21 2026 Amicus brief of Professor Todd Zywicki and the Center for Individual Freedom submitted.
Main Document Certificate of Word Count Proof of Service
May 21 2026 Amicus brief of Professor Saikrishna B. Prakash submitted.
Main Document Proof of Service Certificate of Word Count
May 21 2026 Amicus brief of House Majority Leader Steve Scalise, et al. submitted.
Main Document Certificate of Word Count Proof of Service
Attorneys
Attorneys for Petitioners
Kannon K. Shanmugam
Counsel of Record
Davis Polk & Wardwell LLP
1050 17th Street, N.W.
Washington, DC 20036

kshanmugam@davispolk.com
Ph: (202) 962-7000
Party name: Suncor Energy (U.S.A.) Inc., et al.


Attorneys for Respondents
Kevin K. Russell
Counsel of Record
Russell & Woofter LLC
1701 Pennsylvania Ave., NW
Suite 200
Washington, DC 20006

kr@russellwoofter.com
Ph: 2022408433
Party name: Cty. Comm'rs of Boulder Cty., et al.


Marco Benjamin Simons
Law Office of Marco B. Simons
6218 Georgia Ave NW
Ste 1 #594
Washington, DC 20011

marcosimonslaw@gmail.com
Ph: 9176963304
Party name: Cty. Comm'rs of Boulder Cty., et al.


Other Attorneys
Michael Lee Francisco
Counsel of Record
First & Fourteenth PLLC
800 Connecticut Avenue
Suite 300
Washington, DC 20006

michael@first-fourteenth.com
Ph: 202-998-1978
Party name: American Free Enterprise Chamber of Commerce


Matthew Daniel Hardin
Counsel of Record
Hardin Law
101 Rainbow Drive
PMB 11506
Livingston, TX 77399

Matt@MatthewHardin.com
Ph: 202-802-1948
Party name: Government Accountability & Oversight


Jennifer K. Hardy
Counsel of Record
Boyden Gray PLLC
800 Connecticut Ave. NW, Suite 900
Washington, DC 20006

jhardy@boydengray.com
Ph: (202) 955-0620
Party name: Professor Saikrishna B. Prakash


Jared Michael Kelson
Counsel of Record
Boyden Gray PLLC
800 Connecticut Ave NW, Suite 900
Washington, DC 20006

jkelson@boydengray.com
Ph: (202) 955-0620
Party name: House Majority Leader Steve Scalise, et al.


Kevin Franz King
Counsel of Record
Covington & Burling LLP
One CityCenter
850 Tenth Street NW
Washington, DC 20001

KKING@COV.COM
Ph: 2026625488
Party name: Professor Todd Zywicki and the Center for Individual Freedom


Michael Hugh McGinley
Counsel of Record
Dechert LLP
2929 Arch Street
Cira Centre
Philadelphia, PA 19104

michael.mcginley@dechert.com
Ph: 202-261-3378
Party name: Save Our States


Amy Catherine Miller
Counsel of Record
Eimer Stahl LLP
2 East Mifflin Street
Suite 703
Madison, WI 53703

amiller@eimerstahl.com
Ph: (608) 620-8347
Party name: Professor Jason Johnston


Maura Kathleen Monaghan
Counsel of Record
Debevoise & Plimpton LLP
66 Hudson Boulevard
New York, NY 10001

MKMONAGHAN@DEBEVOISE.COM
Ph: 212-909-6000
Party name: Multinational energy, transportation, and manufacturing companies


Cody Lawrence Reaves
Counsel of Record
Torridon Law PLLC
801 17th Street, NW
Suite 1100
Washington, DC 20006

creaves@torridonlaw.com
Ph: (202) 249-6900
Party name: Senior Foreign Affairs Officials Michael R. Pompeo, James Addison Baker III, Nikki Haley, and Herbert R. McMaster


Gene Clayton Schaerr
Counsel of Record
Schaerr | Jaffe
1717 K Street NW, Suite 900
Washington, DC 20006

GSCHAERR@SCHAERR-JAFFE.COM
Ph: 202-787-1060
Party name: Protect the First Foundation


Eugene Volokh
Counsel of Record
Schaerr Jaffe LLP
One Embarcadero Center
Suite 1200
San Francisco, CA 94111

evolokh@schaerr-jaffe.com
Ph: 415-562-4942
Party name: Neutral Principles


Jennifer H. Weddle
Counsel of Record
Greenberg Traurig
1144 Fifteenth Street
Suite 3300
Denver, CO 80202

weddlej@gtlaw.com
Ph: (303) 572-6500
Party name: Coalition of Large Tribes


John Marc Wheat
Counsel of Record
Advancing American Freedom, Inc.
801 Pennsylvania Ave., NW
Suite 930
Washington, DC 20004-2729

MWHEAT@ADVANCINGAMERICANFREEDOM.COM
Ph: (202) 780-4848
Party name: Advancing American Freedom


Jeffrey Steven Beelaert
Counsel of Record
Givens Pursley LLP
601 West Bannock Street
Boise, ID 83701

jbeelaert@givenspursley.com
Ph: (208) 388-1218
Party name: Professor Derek T. Muller


Alexander Barrett Bowdre
Counsel of Record
Office of Alabama Attorney General
501 Washington Avenue
Montgomery, AL 36130-0152

barrett.bowdre@AlabamaAG.gov
Ph: 334-353-8892
Party name: State of Alabama and 25 Other States


Charles Justin Cooper
Counsel of Record
Cooper & Kirk, PLLC
1523 New Hampshire Avenue, N.W.
Washington, DC 20036

ccooper@cooperkirk.com
Ph: 202-220-9600
Party name: Senators Ted Cruz, Chuck Grassley, Mike Lee, and Ted Budd


Tristan L. Duncan
Counsel of Record
Shook, Hardy & Bacon
2555 Grand Boulevard
Kansas City, MO 64108

TLDUNCAN@SHB.COM
Ph: 816-474-6550
Party name: General (Retired) Richard B. Myers and Admiral (Retired) Michael G. Mullen


Lawrence S. Ebner
Counsel of Record
Atlantic Legal Foundation
1701 Pennsylvania Ave NW, Suite 200
Washington, DC 20006

lawrence.ebner@atlanticlegal.org
Ph: 202-729-6337
Party name: Atlantic Legal Foundation, Washington Legal Foundation, and Federation of Defense & Corporate Counsel


Lawrence S. Ebner
Counsel of Record
Atlantic Legal Foundation
1701 Pennsylvania Ave NW, Suite 200
Washington, DC 20006

lawrence.ebner@atlanticlegal.org
Ph: 202-729-6337
Party name: Atlantic Legal Foundation and Federation of Defense & Corporate Counsel


Laura Anne Foggan
Counsel of Record
Lavin Rindner Duffield LLC
1717 K Street, NW
Suite 900
Washington, DC 20004-2595

lfoggan@lrd.law
Ph: 2026242774
Party name: American Property Casualty Insurance Association, Complex Insurance Claims Litigation Association, and Reinsurance Association of America


Frank Dawson Garrison IV
Counsel of Record
Pacific Legal Foundation
3100 Clarendon Blvd., Suite 1000
Arlington, VA 22201

FGARRISON@PACIFICLEGAL.ORG
Ph: (202) 888-6881
Party name: Pacific Legal Foundation


Philip S. Goldberg
Counsel of Record
Shook Hardy & Bacon LLP
1800 K Street, NW
Suite 1000
Washington, DC 20006

pgoldberg@shb.com
Ph: 202-783-8400
Party name: The National Association of Manufacturers


Tyler Green
Counsel of Record
Consovoy McCarthy PLLC
222 S. Main Street
5th Floor
Salt Lake City, UT 84101

TYLER@CONSOVOYMCCARTHY.COM
Ph: (703) 243-9423
Party name: Consumers' Research


Andrew Michael Grossman
Counsel of Record
Baker & Hostetler LLP
1050 Connecticut Avenue, N.W.
Suite 1100
Washington, DC 20036

AGROSSMAN@BAKERLAW.COM
Ph: 2028611697
Party name: The Buckeye Institute


Sarah Elizabeth Roy Harbison
Counsel of Record
Pelican Instititue for Public Policy
400 Poydras St., Suite 900
New Orleans, LA 70130

sarah@pelicaninstitute.org
Ph: 504-500-0506
Party name: The Pelican Institute For Public Policy and Michael Toth


Sarah Michelle Harris
Counsel of Record
Department of Justice
950 Pennsylvania Avenue
Washington, DC 20530

Andre.R.Rogers2@usdoj.gov
Ph: 202-514-2217
Party name: United States


William McGinley Jay
Counsel of Record
Goodwin Procter LLP
1900 N Street, N.W.
Washington, DC 20036

WJAY@GOODWINLAW.COM
Ph: 2023464000
Party name: The Chamber of Commerce of the United States of America


Thomas Michael Johnson Jr.
Counsel of Record
Wiley Rein LLP
2050 M Street NW
Washington, DC 20036

TMJOHNSON@WILEY.LAW
Ph: 2027194550
Party name: CTIA-The Wireless Association


Ivan Laurence London
Counsel of Record
Mountain States Legal Foundation
2596 South Lewis Way
Lakewood, CO 80203

wtrachman@mslegal.org
Ph: (303) 292-2021
Party name: Professor Richard Epstein and Professor John Yoo


Zac Morgan
Counsel of Record
Washington Legal Foundation
2009 Massachusetts Avenue, N.W.
Washington, DC 20036

zmorgan@wlf.org
Ph: 202-588-0302
Party name: Washington Legal Foundation, National Federation of Independent Business Small Business Legal Center, Inc., National Association of Wholesaler-Distributors


Mark Andrew Perry
Counsel of Record
Weil, Gotshal & Manges, LLP
2001 M Street, N.W.
Suite 600
Washington, DC 20036

MARK.PERRY@WEIL.COM
Ph: (202) 682-7000
Party name: American Petroleum Institute


Michael A. Petrino
Counsel of Record
THE CENTER FOR INDIVIDUAL RIGHTS
1100 Connecticut Avenue, NW
Suite 625
WASHINGTON, DC 20036

petrino@cir-usa.org
Ph: 202-441-1799
Party name: Center for Individual Rights


James Matthew Rice
Counsel of Record
Office of Tennessee Attorney General
P.O. Box 20207
Nashville, TN 37202

MATT.RICE@AG.TN.GOV
Ph: (615) 532-6026
Party name: State of Tennessee


Paul E. Salamanca
Counsel of Record
279 Cassidy Avenue
Lexington, KY 40502

psalaman20@gmail.com
Ph: 8593387287
Party name: The Center for Environmental Accountability


Richard A. Samp
Counsel of Record
3815 N. Ridgeview Road
Arlington, VA 22207

rasamp@verizon.net
Ph: 703-505-2271
Party name: Breakthrough Institute


Ilya Shapiro
Counsel of Record
Manhattan Institute
52 Vanderbilt Ave.
New York, NY 10017

ishapiro@manhattan-institute.org
Ph: 212599-7000
Party name: Frontier Institute, Independence Institute, Pelican Institute, and Manhattan Institute


Cary Silverman
Counsel of Record
Shook, Hardy and Bacon LLP
1800 K Street NW
Suite 1000
Washington, DC 20006

csilverman@shb.com
Ph: (202) 783-8400
Party name: American Tort Reform Association


Oramel Horace Skinner
Counsel of Record
Law Office of O.H. Skinner
7301 N 16th Street
Suite 102
Phoenix, AZ 85020

ohskinner@ohskinnerlaw.com
Ph: 6176159861
Party name: Former State Solicitors General


Ryan Joseph Walsh
Counsel of Record
Eimer Stahl LLP
2 East Mifflin Street
Suite 703
Madison, WI 53703

rwalsh@eimerstahl.com
Ph: (608) 620-8346
Party name: Former State Supreme Court Justices


Ryan Joseph Walsh
Eimer Stahl LLP
10 East Doty Street
Suite 621
Madison, WI 53703

rwalsh@eimerstahl.com
Ph: (608) 620-8346
Party name: Professor Jason Johnston


Katherine Crawford Yarger
Counsel of Record
Lehotsky Keller Cohn LLP
700 Colorado Blvd., #407
Denver, CO 80206

katie@lkcfirm.com
Ph: (303) 717-4749
Party name: Associated Governments of Northwest Colorado, Archuleta County, Delta County, Grand County, Garfield County, Mesa County, Montezuma County, Montrose County, and Rio Blanco County