Jenner & Block Files Amicus Brief on Behalf of the Fort Mojave Indian Tribe Urging SCOTUS to Protect Tribal Sovereignty

Jenner & Block filed an amicus brief before the Supreme Court of the United States on behalf of the Fort Mojave Indian Tribe in South Point Energy Center LLC v. Arizona Department of Revenue. The brief calls on the Court to reverse Arizona court rulings that upheld more than $20 million in state property taxes on a power plant constructed and operated by South Point Energy Center, LLC, on the Tribe’s reservation under a lease between the Tribe and South Point regulated by the US Department of the Interior in accordance with federal law.  

The brief further urges the Court to uphold tribal sovereignty under express and implied preemption principles of federal Indian law, arguing: “The decisions of the Arizona courts fundamentally misconstrue the Indian Reorganization Act and drastically discount the strong tribal and federal interests at stake while according primacy to the State’s general, nondescript interests in raising revenue.” 

“[T]hose decisions put the Tribe to an impossible choice—step aside and abdicate its own regulatory authority, or forego non-Indian development on tribal lands altogether. No sovereign should be put to that choice,” the brief states. 

Three federally recognized Native American tribes and four tribal organizations joined as amici curiae in support of the Fort Mojave Indian Tribe: Inter Tribal Council of Arizona, Navajo Nation, Gila River Indian Community, Morongo Band of Mission Indians, National Congress of American Indians, United South and Eastern Tribes, and Indian Gaming Association.  

The Jenner & Block team on the matter includes Partners Charles W. Galbraith and Adam Unikowsky, and Associate Andy DeGuglielmo.

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© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

Jenner & Block Files Amicus Brief on Behalf of the Fort Mojave Indian Tribe Urging SCOTUS to Protect Tribal Sovereignty

Jenner & Block filed an amicus brief before the Supreme Court of the United States on behalf of the Fort Mojave Indian Tribe in South Point Energy Center LLC v. Arizona Department of Revenue. The brief calls on the Court to reverse Arizona court rulings that upheld more than $20 million in state property taxes on a power plant constructed and operated by South Point Energy Center, LLC, on the Tribe’s reservation under a lease between the Tribe and South Point regulated by the US Department of the Interior in accordance with federal law.  

The brief further urges the Court to uphold tribal sovereignty under express and implied preemption principles of federal Indian law, arguing: “The decisions of the Arizona courts fundamentally misconstrue the Indian Reorganization Act and drastically discount the strong tribal and federal interests at stake while according primacy to the State’s general, nondescript interests in raising revenue.” 

“[T]hose decisions put the Tribe to an impossible choice—step aside and abdicate its own regulatory authority, or forego non-Indian development on tribal lands altogether. No sovereign should be put to that choice,” the brief states. 

Three federally recognized Native American tribes and four tribal organizations joined as amici curiae in support of the Fort Mojave Indian Tribe: Inter Tribal Council of Arizona, Navajo Nation, Gila River Indian Community, Morongo Band of Mission Indians, National Congress of American Indians, United South and Eastern Tribes, and Indian Gaming Association.  

The Jenner & Block team on the matter includes Partners Charles W. Galbraith and Adam Unikowsky, and Associate Andy DeGuglielmo.

Read More

Related Locations

© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

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