Which energy source is non-renewable?

Geothermal energy is derived from the Earth's internal heat, which is continuously generated by the planet's natural processes. This heat source is virtually inexhaustible in human terms, as it relies on the Earth's geothermal gradient, making it a renewable energy option.

Solar energy harnesses sunlight using photovoltaic cells or solar thermal systems. Since sunlight is abundant and constantly replenished as long as the sun exists, solar energy is classified as a renewable energy source. It has the potential to provide a sustainable energy solution without depleting resources.

Hydroelectric energy is generated by harnessing the flow of water, typically from rivers or dams. This energy source relies on the natural water cycle, which is continually renewed through precipitation. As such, hydroelectric power is considered renewable, provided that water resources are managed sustainably.