Ethiopia has started generating electricity from the controversial mega-dam that is being built on the Blue Nile.
The milestone was reached on Sunday morning when one of the 13 turbines of the Grand Ethiopian Renaissance Dam started power generation in an event officiated by Prime Minister Abiy Ahmed.
"From now on, there will be nothing that will stop Ethiopia," Abiy said.
The dam will be Africa's largest hydroelectric dam upon completion.
"We just started generating power, but that doesn't mean the project is completed," said Kifle Horo, the dam's project manager. "It will take from two and half to three years to complete it."
The dam, which will have a total power generating capacity of 6,500 megawatts, has been a source of tension between Ethiopia and the other riparian states, Sudan and Egypt.
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Ethiopia has already conducted two fillings of the dam, but the speed at which it will be filled and the amount of water that will be released during drought seasons remains unsolved.
Egypt fears a quick filling of the dam will reduce its share of Nile waters and seeks a binding legal agreement in case of a dispute.
But Abiy said the dam would benefit Egypt and Sudan.
"We want to export our pollution-free electricity to Europe through Sudan and Egypt, so the way forward is co-operation among us. Ethiopia doesn't want and intend to harm anyone else," he said.
Ethiopia contends the $4.2-billion US dam is essential for its development and will enable it to distribute power to its population of more than 110 million.
Several rounds of talks have been held in attempts to solve the xjmtzywstalemate.
The dam's construction started in 2011 and the completion date was missed years ago due to embezzlement and design flaws.