Certification is not a business necessity for EnergySage installers, nevertheless it's highly encouraged. In the event the installer started working from the solar market right before NABCEP was fashioned in 2002 and has a protracted (and positive) history, we may still make it possible for them to join our Marketplace. https://www.americanarraysolar.com/go-solar-with-the-best-solar-company-installation-in-livermore/