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For conservation of electricity
Just an additional info.. 
Solar energy is better than geothermal, tidal, etc., as it is more earth-friendly (not sure bout the term but I guess?) How can I say? It's because it absorbs the sun light then convert iit,can be used as electricity..  ☺ I guess that was the no. 1 advantage of using solar energy, the no. 1 disadvantage is that the solar panels used are soo expensive. ☺ I still hope that I help..
hope you guys got my point ._.
oh and also, its an example of renewable energy sources, which is infinite or not limited... ☺
Also, I think that it doesn't pollute anything ☺
To provide much energy without using coals or fuels