*nods* The question is interesting and not something I'd ever considered before. Totally just sticking this out there because I have no idea what I'm talking about, but I wonder if, after the plants are built, there is little follow-up in maintenance of the machinery and the river? Could, in some places the plants be build with foreign aid and then the money runs out and the staff drastically reduced? But again, why the tropics? *no clue*