The energy is converted to electric energy, but when you use it it gets eventually turned back into thermal energy. In the extreme case you make it worse since

The energy is converted to electric energy, but when you use it it gets eventually turned back into thermal energy. In the extreme case you make it worse since the solar radiation that would have been bounced back by the 'white' desert is now absorbed by the 'black' solar panels, which convert some of it to heat and some of it to electricity which in the end also gets turned into heat.