By Charles S. Brant, Energy Correspondent, Casey’s Energy Opportunities The disaster in the Gulf of Mexico may be the best thing that’s ever happened to green energy producers in the U.S – but the one that benefits the most will probably surprise you.      As the damaged Deepwater Horizon well continues to pump out 5,000 barrels of oil per day into the Gulf, all the major stakeholders are scrambling to find a way to contain the damage. Investors in BP, Anadarko, Transocean, and Halliburton have had a rough few weeks and should be nervous about the future. The growing political firestorm that’s accompanied this ecological disaster is drastically reshaping the energy landscape in the U.S. There’s huge money to be made from the biggest structural change to the energy markets in…