For internal economic reasons, Texas may not want to export electricity. To do so would bring it under federal regulation, and additional taxes.

This reminds me of Andy Grove's article http://www.washingtonpost.com/wp-dyn/content/article/2008/07.... Most thought-provoking was about foreign dependence: Electricity can be transported only over land. Consequently, it will stay in (or stick to) the continent where it is produced.