Which of the following is non-renewable source energy?
a. Hydropower
b. Tidal energy
c. Geothermal energy
d. Nuclear energy

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Hint: A non-renewable resource often referred to as a finite resource is a natural resource which cannot be easily replaced by natural means at a speed sufficient to keep up with supply.

Complete answer:
> Option A is incorrect. Hydropower is one of the most widely advanced, as a renewable energy resource. A large reservoir can be used by building a dam or barrier to create a controlled flow of water which will drive a turbine and generate electricity. Often this source of energy can be more reliable than solar or wind power (especially if it is tidal rather than river) and also allows to store electricity for use when demand reaches a peak.

> Option B is incorrect. This is yet another form of hydro-energy that drives turbine generators using twice daily tidal currents. Although tidal flow is not constant unlike some other sources of hydro-energy, it is highly predictable and can thus compensate for the periods when the tide current is low. Visit our Marine Energy page to find out more.

> Option C is incorrect. By utilizing the natural heat underneath, the surface of the earth, geothermal energy could be used to directly heat homes or produce electricity. Though this harnesses an additional power below our feet, in the United Kingdom geothermal energy is of negligible importance compared to countries like Iceland, where geothermal heat is much better connected.

> Option D is correct. Nuclear energy is energy inside an atom's nucleus (core). Atoms are tiny particles which constitute every object in the universe. In fission small atoms are divided apart while producing small particles or elements which emit photons. Utilizing nuclear fission nuclear power stations produce electricity.

Hence, The correct answer is option (D).

Note: Fossil fuel is responsible for oil spills, acid rain, air pollution, water pollution, etc. Nuclear energy can cause pollution by radiation. They release carbon dioxide into our atmosphere which contributes to global warming and climate change.