I invested in a hydro-energy company once. Turns out it was a scam on the largest scale. They would actually fly potential investors over a hydro-project which was under construction, but NOT owned by them. They had keynote speakers booked at respectable clean energy conferences. They even had agreements in place to order all of the turbines from Germany. The scam was drawn out over about 2 years. I know someone invested over $1,000,000, thankfully I only lost $15k.