I might nitpick and point out that Texas is not flat and dry. It is flat and wet, or dry and hilly. East Texas has the swamps and weather patterns of the tradit

I might nitpick and point out that Texas is not flat and dry. It is flat and wet, or dry and hilly. East Texas has the swamps and weather patterns of the traditional gulf southern states. West Texas has mountains higher than anything on the east coast of the US. The rockies don't just dead end in northern NM, there are sky islands and mountain ranges extending all the way down through Mexico. Central Texas has a bit of both, but the water situation is unreliable enough that while there are a fair number of dams and reservoirs with hydroelectric very little of it is used consistently for electric generation. That is because the water value in the reservoir exceeds its electric generation value. Those dams were built mostly for flood control, so they get hammered every couple years and end up opening spillways, then slowly dropping for years as the remaining water gets used up. The hydro only really takes effect when they are sending water from one lake down to the next for water control purposes.