re: Who are the General Contractors for the plants around Baton Rouge & the rest of Louisiana?

That is too broad of a question. Like someone else said, industrial construction is broken down by the type of work. For example, I work for an industrial civil contractor in TX. We are technically a GC but we specialize in Civil. Others said MMR and Triad. They are I&E companies. Brock/Brand are soft craft companies. Turner and performance would generally be known as general mechanical. I would not argue that Turner probably has over 50% if maintenance contracts and that would include TX as well as LA. I do know Zachry has a whole bunch also. Just depends on the plant and/or units in the plant. Each unit can have their own maintenance bunch and who that is can vary from unit to unit.