The Town of Guilderland has a law that allows homeowners with solar panels on their properties to get a property tax break. https://ecode360.com/32697230 This map shows the properties that take advantage of the tax break currently. If you switch to the satellite view, you can see the individual properties and solar panels up close, which is rather neat.

Data Source: 2019 Final Assessment Roll, as posted by Guilderland Assessors Office and processed via script I wrote. You can obtain the assessment roll here: https://www.townofguilderland.org/assessors-office