Final answer:
Hot water or steam is the form of energy delivered to an electrical generating turbine in a geothermal facility.
Step-by-step explanation:
The form of energy delivered to an electrical generating turbine in a geothermal facility is in the form of hot water or steam.
Geothermal energy uses heat from the Earth's internal geologic processes to produce electricity.
Groundwater percolates down to rocks heated by underlying magma, which converts the water to steam. This steam can then be tapped through wells and brought to the surface to drive generating turbines and produce electricity.