Sorry, you mean Alaska and Hawaii have some sort of connection to the rest of the grid, and Texas does not? Or do you mean that Alaska and Hawaii are not states in the union?
Hawaii's energy needs are 90% based on imported oil. If they seceded, they'd go dark.
While Alaska certainly has the ability to make money off its oil, most of its heating, power and other needs is actually provided by diesel fuel. Add to that the fact that most of the jobs are either government or military related and other industries in the state rely heavily on government subsidies, the state would probably find itself in a real predicament if it cut off contact with its pimp.
Maybe you mean 'most of Texas' and 'only state in the contiguous US'. http://en.wikipedia.org/wiki/Texas_Interconnection
The part of your comment relating secession merits no response.