From my casual perusal, 50% was achieved at one time on a Saturday. The math done by your “opponent” Piyar is far more convincing. Can you counter it. Do you understand it?
Piyar's math doesn't take in to account external costs. What are the costs of pollution from burning coal, land degradation of strip mining coal, and railroading the coal. We externalize these costs by socializing them. The rate payer is not paying for them, the taxpayer is.
The rate payer in Japan didn't pay the external cost of the nuke meltdown. If you factor in those external costs then that power is very, very expensive.
What about the subsidies for wind and solar. Are we subsidizing wind and solar companies or are we subsidizing technology development the same way we subsidize development of clean coal technology. Plus, we subsidize ethanol and nukes a lot more than we do wind and solar.