"Wind and solar are viable, they just don't lessen the needed amount of fossil fuel capacity needed"
I call bullshit. We could put in HVDC transmission lines (Max distance around 3500km or 83% of the width of the contiguous United States) running from east to west and north to south. Those lines are each longer than a weather system is big, so you ship wind power from windy areas to calm areas that need power, and from sunny daylight areas to dark or cloudy areas that need power.
For the rest of the balancing needed, we could, for example, put in one gigantic hydrogen electrolysis and storage and fuel cell generator facility in the geographic center of the country. It would only be 30% round-trip efficient (energy out compared to energy in) however then you just need to install three times the wind and solar you would otherwise need, and Bob's your Uncle. If you don't want to do that, use a bunch of large compressed air storage facilities http://energystorage.org/advan... running at 70% round-trip energy efficient.
And if you still don't want to do very large storage for some reason, then tap into the enormous geothermal energy rersources under the US. Way more than enough energy for the country's needs there. No GHG emissions.
How about a combination of all these strategies. The technology is there. The price is becoming reasonable, and a small and not too punitive carbon tax would make it economical to build all this new infrastructure fast. We just need to get off our asses and do it.