EGYPT and Sudan have rejected an Ethiopian proposal to share data on the operations of its giant hydropower dam on the Blue Nile after negotiations between the three countries in Kinshasa this week ended without progress. Ethiopia is pinning its hopes of economic development and power generation on the Grand Ethiopian Renaissance Dam, which Egypt fears will imperil its supply from the Nile. Sudan is also concerned about the impact on its own water flows. "Ethiopia invites Sudan and Egypt to nominate dam operators for data exchange before the filling of GERD in upcoming rainy seasons," the Ethiopian foreign ministry…