Electricity experts in Louisiana are pretty sure about a few things. Demand from industrial users is poised to climb. Natural gas likely will remain a key source of power generation in the state for years. The entrance of a prominent regional transmission organization brings a new level of connection. What isn't as clear is just how big the wave of industrial demand may be. Or how the expected closure of some coal-fueled power plants in other states will ripple through U.S. power supplies. Or exactly how new transmission and generation will fit together.