So we can expect another conveniently timed 9/11 style attack to justify the NSA's existence and provide a convenient casus beli to attack Iran/Syria. Strictly not engineered by the USA ofc, pinky swear!
Now, let's say, Uncle Sam want to shovel down a truckload of crap down your throat. You of course don't want to eat shit, so refuse, rebel, protest. Now, Uncle Sam is getting good money to do his job, so he tells you first to close your eye, because it'll be a Surprise! First problem: you don't trust Uncle Sam to do this in the first place. Second problem: you still smell crap that leaks from the truck.
This agreement would fail, transparency or not, because of it's content.
The problem with natural power is that it's low yield and relative expensive. You can't serve a country's power requirement unless you're willing to blanket the land with windmills or solar panels.
Nuclear has different problems: proliferation (ironically the countries whining the loudest are the same with the most nuclear weapons), cost of fuel, which is relatively rare and needs further processing, waste disposal, accidents are more dangerous because of the radiation.
Thorium would be a step up in nuclear fuels. Unfortunately we have legacy players here too (processing uranium and handling waste is apparently profitable business) and ones who would lose influence and $$ if cheap electricity replaced oil, coal and gas.