A system of underground pipes heated by Earth s hot interior creates steam from water,...

The scenario describes a geothermal energy system. Geothermal energy harnesses the heat from the Earth's interior to generate steam, which can then be used to produce electricity or provide direct heating. In this case, underground pipes circulate water that is heated by the Earth's internal heat, turning it into steam to generate heat for a building. References:

U.S. Department of Energy (DOE) Geothermal Technologies Office

"Geothermal Energy: Clean Power from the Earth’s Heat" - National Renewable Energy Laboratory (NREL)