Which is exactly what he did. He doesn't actually need to be at the electric power stations throughout the state in order to do that does he?
I'm sure that a lot of Texans would agree with you that Ted Cruz out of state is more of a benefit to Texas than Ted Cruz in state. But maybe we're looking at this all wrong. If we look at it as a brave father willing to travel over a thousand miles and cross the border into a foreign country just to find water and shelter and electricity for his wife and children then it gives it a whole different flavor, doesn't it?