US court rejects a request by tribes to block $10B energy transmission project in Arizona

A federal judge on Tuesday rejected a request by Native American tribes and environmentalists to stop work on a $10 billion transmission line being built through a remote southeastern Arizona valley that will carry wind-generated electricity from New Mexico to customers as far away as California.

The project — approved in 2015 following a lengthy review — has been touted as the biggest U.S. electricity infrastructure undertaking since the Hoover Dam was built in the 1930s.

Two tribes joined with archaeologists and environmentalists in filing a lawsuit in January, accusing the U.S. Interior Department and Bureau of Land Management of refusing for nearly 15 years to recognize “overwhelming evidence of the cultural significance” of the remote San Pedro Valley to Native American tribes including the Tohono O’odham, Hopi, Zuni and San Carlos Apache Tribe.

The suit was filed after Pattern Energy received approval to transmit electricity generated by its SunZia wind farm in central New Mexico through the San Pedro Valley, east of Tucson.

The lawsuit called the valley “one of the most intact, prehistoric and historical… landscapes in southern Arizona,” and asked the court to issue restraining orders or permanent injunctions to halt construction.

In denying the motions, Judge Jennifer Zipps said the plaintiffs were years too late in bringing their claims and that the Bureau of Land Management had fulfilled its obligations to identify historic sites and prepare an inventory of cultural resources.

Tohono O'odham Attorney General Howard Shanker argued during a hearing in March that claims by federal land managers that they could not find any evidence of the valley's significance to area tribes was disingenuous at best. He