Since there was an existing mill (dam to?) should make the study much simpler, like anything else check with the gov, see if their interested in helping with the green power. Or shop around for someone or group to do it for less.
Consider going to the press say gov is all talk and no action, gov gives lip service to wanting green, when its offered its not supported, stopped by bureaucratic games.
Or build it small powering your needs without connecting to the grid. No study would be needed?
Have fun, Scott.