Back to the Future
"1.41GW figure is probably way lower than the actual potential."
If it's acknowledged as being a lowball estimate, why didn't they do the decent thing and "estimate" 1.21GW for full Doc Brown credibility?
Also - it's unclear who will suffer from having the energy removed from the water flow, but it's highly likely to be consumers. Shitty low-pressure shower anyone? Ten minutes to fill your kettle for a brew? (Oh, I forgot - it's the USA, no decent cups of tea there hence no kettles. OK, coffee machine then.) Someone has to suffer - ye cannae break the laws of physics and specifically Bernoulli's equation.