ADDIS ABABA: Ethiopia moved on Thursday to reassure Egypt about its water supply after completing work on a controversial giant $4 billion dam on the Blue Nile.

“To our neighbors downstream, our message is clear: the dam is not a threat, but a shared opportunity,” Prime Minister Abiy Ahmed said.

“The energy and development it will generate stand to uplift not just Ethiopia. We believe in shared progress, shared energy, and shared water. Prosperity for one should mean prosperity for all.”

The Grand Ethiopian Renaissance Dam is 1.8 km wide and 145 meters high, and is Africa's largest hydroelectric project. It can hold 74 billion cubic meters of water and generate more than 5,000 megawatts of power — more than double Ethiopia’s current output. It will begin full operations in September.

Egypt already suffers from severe water scarcity and sees the dam as an existential threat because the country relies on the Nile for 97 percent of its water. President Abdel Fattah El-Sisi and Sudan’s leader Abdel Fattah Al-Burhan met last week and “stressed their rejection of any unilateral measures in the Blue Nile basin.” They were committed to safeguarding water security in the region, Sisi’s spokesman said.