 The supercritical fluid is then injected into a subsurface geologic reservoir through an injection well.This method allows a wide array of subsurface geologic reservoirs to become commercially viable for electric production.This includes reservoirs with highly permeable and porous sedimentary stratum, a depleted hydrocarbon field, a depleting hydrocarbon field, a depleted oil field, a depleting oil field, a depleted gas field, or a depleting gas field.