The world needs a new source of energy, an unspillable source.

where would be a good place to build a hydroelectric dam in bolivia? 10 points?

for my history project i have to come up with a business, and i have bolivia. i want to open another hydroelectric power plant/dam but i don’t know where in bolivia i should build it. one of the rivers, obviously, but which one would be best?
thanks in advance!