Hydro Electric has been the mainstay for electric power for over 100 years. It is the only type of electric power that competes with grid electric power prices. Hydro electric is 75% of all renewable energy. 20% of the world's electric power production. Hydroelectric is the only cost effective way to generate reliable, sustainable electric power. It is green in nature and will help reduce the carbon footprint of any location. The major benefit is that it can be a great off grid solution to remote homes, farms and recreation areas. The applications are huge. This is a unbias review. I am in the Renewable Energy Systems Research and Development field. Hydro and Solar to me are the best solutions for our future.