I agree it's going to be a combination of solutions with energy storage, depending on what you need. Batteries are good for short-term, portable storage. The ot

I agree it's going to be a combination of solutions with energy storage, depending on what you need. Batteries are good for short-term, portable storage. The other solutions you mentioned may be better for long-term, non-portable storage. I also think we can get more mileage out of chemical fuels produced with renewables - ammonia, hydrogen. https://www.greentechmedia.com/articles/read/siemens-ammonia-hydrogen-energy-storage https://www.greentechmedia.com/articles/read/siemens-ammonia... https://www.sciencemag.org/news/2019/03/new-fuel-cell-could-help-fix-renewable-energy-storage-problem https://www.sciencemag.org/news/2019/03/new-fuel-cell-could-...