You do still need generation closer to Texas that works, but as a whole the grid can balance the generation and output a bit depending on the gradient between the sources.

Imagine a 'bouncy castle' with several input fans. Texas is like an entry ramp that isn't hooked up to either of two big banks of fans and sinks next to it. If it were just ganged in with one of those other two groups even though Texas is having a bad time the other blowers could compensate in aggregate.