A European consortium has tapped the heat energy of 200-degree Centigrade granite five kilometers down. Through blasting, the rocks are fractured such that brine can be injected into the rocks and drawn out for power generation or heating. Flow rates sufficient to generate 1.5 megawatts of power have been achieved. To be profitable, the flow rate needs to be doubled. Testing is underway to determine whether acid can be used to reduce flow resistance.