I really don't see much difference between EGS and what we are doing. Both methods use hot rock to raise the temperature of water. With EGS you pump the water in through an injection well then extract it through a production well. What we do is the same, except that the water already is hot and available under groud. Once extracted by a production well it is injected by an injection well. The only difference is where the water comes from.
EGS however negates the need to find hot water geothermal formations and just look for hot geological formations.