I have a large enough stream in the back yard for a mini hydro system. At 30 degree temperatures I can probably produce enough to supply all my needs at least 9 months of the year.
But, my elec. bill this month was $56. Average in the summer is about $35 and the most, with below zero temperatures and a 100 foot heat trace on, might be $200.
So is the cost of putting in a mini hydro system worth it? If I allow $1,500 - $2,000 for the hydro, I won't see a payoff for 3-4 years.