I don’t expect this to be a problem because by the time humans would be using this much energy we should be easily capable of constructing simple megastructures. One would only need to decrease the amount of IR light that hits the earth with massive but relatively cheap (at least once you have serious space industry) IR filters in order to decrease the earth’s temperature without impacting anything dependant on the sun’s light.
I don’t expect this to be a problem because by the time humans would be using this much energy we should be easily capable of constructing simple megastructures. One would only need to decrease the amount of IR light that hits the earth with massive but relatively cheap (at least once you have serious space industry) IR filters in order to decrease the earth’s temperature without impacting anything dependant on the sun’s light.