Solar energy:
Solar energy – while abundant – is not constant. Solar energy plants are vulnerable to changes in cloud cover and weather patterns – a plant’s efficiency may be significantly compromised by a cloudy day or afternoon storm.
Also it is important to know that it is very expensive to bring a solar plant on line. Many photovoltaic cells are made of rare earth minerals like silicon and other metals like mercury, lead, and cadmium. These materials required in PV cells can be rare, expensive, and potentially harmful to the environment.

Wind energy:
Wind energy, on the other hand, does not produce harmful atmospheric emissions.
Its construction can be quick and has a high payback. Wind has one of the fastest “energy payback times” of any source of electricity. With careful siting and community outreach, wind farms can be built in a fraction of the time it takes to install their conventional counterparts.
However it is important to note that, similar to solar energy, wind is an intermittent energy source. Therefore, more sophisticated technology in energy storage must be adopted to help store excess energy produced when demand is low.
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