>You understand Costa Rica is the size of West Virginia and has more opportunities to use thermal power and wind power than the majority of the world?

Scotland. 97% powered by renewable sources in 2020. Similar time period to Costa Rica for number of days powered 100% by renewables.

>The grid needs spinning inertia to be stable. You will not be able to ever run 100% renewable with today's technology.

That's what you wrote. I'm pointing out that there is "spinning inertia" even with renewables, and it is possible to supply power with 100% renewables, contrary to your claim.

> My only point was that right now in the United States we can't go 100% renewable.

Then why didn't you write that, instead of what you actually wrote?

>There isn't enough renewable spinning inertia to do it

All renewable sources except PV have "spinning inertia". And it has been proven to be possible to supply 100% of power via renewable sources.

Wind, hydro electric, solar thermal power plants, etc. All of them except PV cells, and if you want to be pedantic, also excluding Peltier junction generators.

All forms of renewable energy other than photovoltaic cells still produce power via generators, aka "spinning inertia". Costa Rica has run on 100% renewable energy for over 300 days straight in the past, and this year, supplied 98.58% of it's power requirements via renewable sources.