Wrong. Electricity used for doing kinetic and potential energy work do not produce heat other than what is lost due to friction. The majority (90% or so) is converted into kinetic energy or potential energy. But regardless of the energy that you think is lost that same energy would have been lost regardless of the source of electricity, So the scenario which uses solar will have a cooling effect relative to the scenario using fossil fuels. In other words whatever energy that is returned to the atmosphere (which isn't heating the earth's surface) can be ignored because it is the same on both cases. You guys would have never passed an engineering class.