[oil pan 4]

Solar becomes a liability by 10% as shown by California, the correct number is some where around 5%. Solar is only good for covering the peak day time load.
Wind becomes a liability some where around 20% to 25% and that depends on a lot. Such as how evenly distributed the wind farms are to the loads. Wind could make up 50% of a power grids power with the perfect distribution of loads and wind turbines with reliable wind.
For example in Texas if you find Abilene, draw a line straight north and west, that western block of Texas generates most of their wind power. The problem is getting that power a thousand miles south and several hundred miles east.