Lava is really the magma which is breaking right up through the earth's crust. Sincerely, Nikki N. Dear Nikki, No. Future generations will always have geothermal energy. The heat is always being generated deep in the earth. The water is replenished by rainfall and by returning the used water back into the reservoir.
Geothermal energy is everywhere but mostly at a safe depth.
From, Louis A. Dear Louis, We would if we could. Making electricity needs high temperature geothermal near the surface to be economical with present day technology. So far, we only find high temperature geothermal in a few places. Some other countries with fewer people and more volcanoes could get all their electricity from geothermal resources.