We built a 1000 watt wind turbine to help charge the battery bank that powers our offgrid home. It's a permanent magnet alternator, generating 3 phase ac, rectified to dc, and fed to a charge controller.
Build Your Own Vertical-Axis Wind Turbine On The Cheap - Didn't realize vertical wind turbines existed. The scale of this one and the fact that it supposedly doesn't require gale force winds to produce power makes it definitely worth looking into.
How to make "pico-hydroelectric" power - doesn't require a lot of water and generates enough power for at least one household. I was thinking something like this in-line with your water inlet system since it is already under pressure.