What is considered an inexhaustible source of power that could satisfy global energy needs if economically harnessed?

Solar energy is considered an inexhaustible source of power because it is derived from the sun, which is expected to continue emitting energy for billions of years. Unlike fossil fuels or other energy resources that can be depleted, solar energy is abundant and sustainable as it does not run out. If effectively harnessed and developed economically, solar energy has the potential to meet global energy needs due to its wide availability and the capability to be captured in nearly every part of the world.

In terms of context, while nuclear energy can provide significant amounts of power and is considered a low-carbon energy source, it relies on finite resources like uranium. Wind energy is also renewable and sustainable, but its availability varies based on location and weather conditions. Hydro energy, while renewable, is dependent on water flow in rivers and can be impacted by environmental changes.