Does geothermal energy depend on the sun?
Geothermal energy does not depend on the sun. Geothermal energy is energy that comes from about 55 feet below Earth's surface.
Geothermal energy sources depend on primeval heat from the Earth's core. This is mainly derived from radioactive decay in the Earth's core, with a small contribution from gravity pressure. Similarly, Nuclear Reactors do not depend on the Sun for their energy. And one day we hope, the nuclear fusion problem will be cracked. And to a small extent, the electrical energy developed in a battery does not depend on the Sun, but most of the…
Tidal energy comes from the energy of Earth's rotation. This is unrelated to the Sun's radiation. Nuclear energy comes from elements that are available on Earth - it doesn't depend on the Sun's radiation either. Geothermal energy comes from these same elements, which gradually decay, keeping Earth's interior hot.