Egypt said Friday that Ethiopia has consistently lacked the political will to reach a binding agreement on its now-complete dam, an issue that involves Nile River water rights and the interests of Egypt and Sudan.

ADDIS ABABA, Ethiopia — Ethiopia’s prime minister said Thursday that his country’s controversial power dam on the Nile has been completed.

Ethiopia says it has completed building a mega-dam on the Blue Nile that has long been a source of tension with Egypt and Sudan. Launched in 2011 with a $4bn (£2.9bn) budget, the dam is Africa's biggest hydro-electric plant,