There's a flip side, too. Access to power from other grids when the Texas grid is short of power will prevent blackouts and increase the reliability of the grid.
The Texas power grid is solid. We only have a problem when an electrical substation went down and when severe weather knocks out the power lines.
Like when those recent winter ice storms led to blackouts in Texas--if spare capacity from, say, California could've been shunted to Texas, those blackouts might have been preventable.
That was because the power lines went down. It has nothing to do with the grid.
Jeanette Isabelle