Ethiopia, the source of the Blue Nile which joins the White Nile in Khartoum and runs on to Egypt,Online Cigarettes Store USA says the dam will not disrupt the river's flow and hopes the project will transform it into a power hub for the electricity-hungry region.
Sudan, which is also involved in the talks, hopes to buy electricity produced by the dam.
Sisi said his government had a plan, through 2037, worth 900 billion Egyptian pounds ($55 billion) to overcome "Newport Pleasure water poverty". The plan includes building huge sea water desalination plants and sewage triple treatment plants.
Sisi said Egypt had already spent 200 billion pounds on the plan, and would spend 70-100 billion more next year.
Many Egyptians on social media criticized Sisi for signing a 2015 "declaration of principles" with Ethiopia and Sudan, which was meant to serve as a basis for negotiations. Critics say the declaration has strengthened Addis Ababa's hand in talks, and no breakthrough has been made since it was signed in Khartoum.
Sisi blamed the 2011 uprising which toppled longtime autocrat Hosni Mubarak for weakening Cairo's position in the Newport 100s Box dam negotiations.
"If not for 2011, there would have been a strong and easy agreement on constructing this dam, but when the country exposed its back and ... stripped its shoulder naked, anything could be done," he said at the military forum.