Ethiopia has inaugurated the Grand Renaissance Dam (GERD), Africa's largest hydroelectric project, sparking celebration in Ethiopia but deepening diplomatic tensions with downstream neighbor Egypt.

• The GERD, built at a cost of $4 billion, is designed to generate 5,000 megawatts of electricity, more than doubling Ethiopia's current capacity.
• Images showed Ethiopian Prime Minister Abiy Ahmed touring the site with Kenyan President William Ruto, Somalian President Hassan Sheikh Mohamud, and African Union chief Mahmoud Ali Youssouf.
• Egypt, which relies on the Nile for 97 percent of its water, views the dam as an "existential threat," with President Abdel Fattah al-Sisi vowing to defend Egypt's water security.