Con to the question "Can Alternative Energy Effectively Replace Fossil Fuels?"
"For all the talk of 'grid parity' the simple reality is that even combined with far more power generation from natural gas, renewable alternatives will need decades to push out coal. And the irony will be that as demand for coal lessens, it will become cheaper and cheaper, making it even more attractive for the coal-burning power plants that survive the coming cull...
In short, unless we're willing to put up with blackouts that freeze grandma in the winter and melt her in the summer, coal will remain a mainstay of U.S. power generation for decades to come."
"Solar Power Is Booming, but Will Never Replace Coal. Here's Why," forbes.com, Apr. 24, 2014