well nothing, except if that's your ultimate goal, which it is for progressives.
there is criticism of solar panels, but progressives won't think about this, they just assume solar panels are good, or that it's the only solution.
http://www.amazon.com/Green-Illusions-Secrets-Environmentalism-Sustainable/dp/0803237758
It's not about me being correct, I'm just repeating correct information from engineers who have studied "green" energy. I'm an engineer myself, and I know that "green" buildings are not at all green. People will ignore certain things, like the needed transportation, mining, and equipment used to building, operate, and demolish the building.
it's physically impossible to create energy. You're ignoring the energy that is needed in the manufacturing of the plant, in the transportation of materials in and out, of the mining operation for the raw materials, etc.
edit in regards to transportation, there's no such thing as electric jets or electric freight ships, and there never will be. Tesla requires parts from Japan, requiring diesel, and this will never change. As the world ramps up electric cars, we'll have to use even more diesel to make electric cars.
There's also the massive amount of oil/coal/gas currently needed to building & operate the plant.
You're ignoring everything except the electricity used. Solar panels have massive downsides, including the need to use oil to manufacture them, rare earth metals required, and toxic materials used in the panels.
This stuff is greenwashing at its finest.
http://www.amazon.com/Green-Illusions-Secrets-Environmentalism-Sustainable/dp/0803237758
Have you read "Green Illusions" http://www.amazon.com/Green-Illusions-Secrets-Environmentalism-Sustainable/dp/0803237758