The Mexican constitution prohibits foreign ownership in the energy sector.
The first consideration is whether foreign ownership of gas plants is even permitted in Mexico? Since four of them have received authorization to operate, one would think that this is not a problem. It helps that each plant will invest billions in the local economy. But anyone who hasn’t read Mexico’s Foreign Investment Law lately might be a bit surprised to find that foreign investment in energy and gas is a category that is off-limits to foreign participation.
What is going on here is that President Vicente Fox favors the gas plant investments, and he is turning a blind eye to the law as written and on the books. Critics are attacking him on this, accusing him of selling out to the highest bidder.
http://www.mexidata.info/id408.html