2. Grid level storage has many forms, it does not need to be batteries. For example, hydro can be used as medium term storage. And even short term the rate at which water is passed through the damns can be varied to balance out the solar.

3. Yes, but if you look at their production mix, coal has come down from 75% to 60% over the past 10 years, the large majority of that has been taken up by renewables [0].

[0]: https://ourworldindata.org/grapher/share-elec-by-source?coun...