We need a mix of 3 or more renewable sources, and some storage to get to 100% renewable energy. Biomass is renewable, and can come from sewage and farm waste, or it can be pyrolysis. Methane can be stored, and used more easily than natural gas.
Pumped storage, and other gravity based storage systems are easy to do. Millions of EV's could be used to buffer the grid, and grid batteries are being developed that are far less expensive and longer lasting than lithium. Distributed small scale battery storage will help a lot.
Click on the map to see what the renewable energy system in your area could look like:
Our 100% Clean Energy Vision - The Solutions Project
I'm not sure what the worry about "nameplate capacity" is all about.
Enough sunlight hits the earth in ONE HOUR to power ALL HUMAN NEEDS FOR ONE YEAR. And wind, wave, tidal, biomass, geothermal in total, could power the world about 16X OVER.