Good, at least there is some use for otherwise arid ground. As a source of high temperature you could also use it as a first stage for waste incineration and power generation at the same time. If it gets high enough to handle dioxin you can use an outer layer as a destruction layer for waste, generating both power and destroying as well. You could even use a small secondary mirror to have a furnace at ground level to incinerate or calcine low level waste, or to run a desalination system for ultra brackish ground water to feed the facility.
