A good number of countries are above 80%, including Norway, Denmark is at 60%, Germany gets ~30% from wind and solar combined. Local climate and intraday demand is a HUGE variable lost in these numbers. It's not so much the high temperature, but it's hot 16+/- hours a day for 6-8 months.
The A/C Load in Texas is off the charts relative to Norway, Denmark & Germany. ERCOT Demand @ 5 am was 48,350 MW, Demand @ 6 pm ~ 79,100, a intra-day swing of over 30,000 MW. Just for the intraday swing, you need the equivalent of 12 South Texas Nuclear Power Plants, 10,000 wind mills, or a big ass battery system!!!
The Siemens Energy simple cycle gas turbines that deliver 150 MW within 10 minutes are good for quick starts, but they are 35% less efficient than the combined cycle, which raises the fuel cost proportionally. A couple hundred of these would do the trick.
I'm all for renewables, but you need a reliable back up system, and today, fossil fuel power generation makes more sense than batteries.