The ECO checks out a micro hydropower generation system that generates power without the need to modify the environment (eg constructing dams). www.seabell-i.com
If you are in Hawaii and interested in getting a quote on putting in a photovoltaic electrical system that ties into the grid, send an e-mail to docchild@gmail.com. Did you realize you can currently get grants for up to 65% of the cost of a new system?