Here is a brochure of the PVR underwater turbine.
Here is a form for providing us the information to make an estimate for your turbine, whatever the size. You can fill it out by hand using the pdf and scanning it and emailing it or by downloading the Word version and filling it out electronically and emailing it.
Here is a testimony of the testing at Holyoke Gas and Electric.
Letter from HGE re PVR testing results July 2-2015-color