Washington is putting real money behind advanced nuclear. The US Department of Energy is gearing up to hand X-energy another $1 billion for its planned nuclear project with Dow in Texas, bringing total federal funding available for the project since 2021 to as much as $2.15 billion. That is no longer demonstration-project pocket change. CEO Clay Sell said Thursday that DOE had informed X-energy of the additional funding through the Advanced Reactor Demonstration Program, which is intended to move next-generation reactors toward commercial deployment.…