I am not sure. I talked to an attorney who, among other clients, represented the Sierra Club back then and he made it seem like it was obvious why they would oppose the power lines into Boquillas but did not state a reason. To my simple way of thinking it was equally obvious that we would want to help the people of Boquillas and providing power would be a good way to help them particularly since most of the infrastructure was already in place in anticipation.
Al