Your belief that all waste heat from electricity usage heats the surface of the planet like solar radiation does is incorrect. a large portion of electricity usage is used to perform work and the amount of energy used to perform that work must be subtracted from the total and that only the friction created from doing that work created heat. Furthermore what heat that is created from electricity usage doesn’t heat the surface of the planet like solar radiation does. It heats the surrounding air. And what heat that is close to the surface doesn’t heat the surface like photons do. It radiates in all directions. So a good portion of that heat does not heat the surface of the planet.Ding believes electricity doesn't heat the planet....it's magic!
Even if waste heat from electricity usage heated the surface in exactly the same way as photons do that there would still be an incremental cooling effect because the waste heat is the same in both cases. Replacing fossil fuels with solar does not increase the amount of waste heat generated. But the generation of electricity effectively reduces the incoming solar radiation by converting photons into electricity that would have otherwise produced heat.