doing the math on a spreadsheet here, with a few assumptions on properties, on a single 5x 12 plastic frame portlight (gray industries).....most of those will meet the u-factor and total loss numbers to qualify if the polycarbonate is over 3/16 in thick. larger portlights may need to go to 1/4" . If you are using the SS frames..... The window would have to be much thicker.
regular 1/2 polycarbonate hatches/doors would meet the specs. A new electric hydronic heating hotwater system might. This would be allowed in a second home.
photovoltaic/windpower systems might have different aspects tho. most solar systems are set up to drive 12/24 charging systems and in the past when I have tried to get those approved, there has been reluctance from SNOPUD to take the the excess power.( Or issue the generator certificate). and any system would need a lot of manufacturer documentation of an engineers analysis to prove they meet the requirements.
(however the IRS is even less qualified to determine whethere a given system meets local fire, electrical, nmea codes.)
so I would probably build and buy first if it was close to cost effective and worry about the tax mertis secondly
They (The utilities) are far more likely to inspect and accept your generating capacity if it is 3 phase or sourced from a rotating generator. (they dont trust small electronic voltage regulation and the controllers for the small gen site systems) your marina might be the same. Also, most of us do not have the boats as the primary residence which is an absolute requirement for solar electric panel qualification for the tax credit.