Minimal? Since when are river valleys appropriate to sacrifice? These places they propose to inundate are enormously important to a wide array of species. And the water is drying up anyway, all wafting up into a warming atmosphere. This is human-brand stupidity and I'll bet some small group of white males stands to profit from the scheme. Dismiss them and send in the wind and solar crews, who will displace WAYYY fewer flora and fauna and still yield up the energy required.