Here is the latest Iowa news from The Associated Press at 3:40 a.m. CDT

LINCOLN, Neb. (AP) — Nebraska is joining Iowa and the city of Council Bluffs in a lawsuit to challenge the federal government’s approval of a tribal casino near Omaha. Attorney General Doug Peterson announced his role in the legal challenge to prevent the Ponca Tribe of Nebraska from building the casino in Carter Lake, Iowa. The National Indian Gaming Commission ruled last year that the tribe can put a casino on five acres of trust land in the city.

DES MOINES, Iowa (AP) — An Iowa-based utility is proposing a massive wind turbine project that would be the nation’s first investor-owned electric utility to generate all of its customer demand from wind energy. Des Moines-based MidAmerican Energy said Wednesday that it’s submitting its proposal for a $922 million wind project to the Iowa Utilities Board. The project is slated to generate enough electricity to power 2.4 million homes. MidAmerican is a subsidiary of Warren Buffett’s Nebraska-based Berkshire Hathaway.

DES MOINES, Iowa (AP) — A lawsuit alleges Iowa’s new voter identification law violates the state constitution. Priorities USA Foundation says the lawsuit was filed Wednesday in Polk County District Court in Des Moines. The national group, which is covering legal costs, provided a copy of the lawsuit. It’s the first legal challenge against the new ID requirement and its provisions. Iowa Secretary of State Paul Pate is named as a defendant in the suit.

HIAWATHA, Iowa (AP) — Iowa income taxes will begin to fall under a tax bill signed into law by Republican Gov. Kim Reynolds. Reynolds signed the bill Wednesday in Hiawatha. Under the law, the state will cut $2.8 billion in corporate and personal income taxes over six years if it meets certain revenue targets. If not, some cuts would be delayed. Middle-class families are expected to save an average of $86 to $257 next year. A typical family of four would save about $7 every two weeks.