Certification is just not a organization requirement for EnergySage installers, but it's highly encouraged. In case the installer started off working during the solar sector right before NABCEP was formed in 2002 and it has a lengthy (and constructive) background, we should still allow for them to hitch our Market. https://www.americanarraysolar.com/tips-to-save-more-on-your-energy-consumption-with-alternative-energy/