Certification Is just not a business need for EnergySage installers, but it's highly suggested. In the event the installer started working within the solar market in advance of NABCEP was fashioned in 2002 and it has an extended (and optimistic) history, we should still let them to affix our Marketplace. https://www.americanarraysolar.com/4-key-focuses-when-hiring-solar-companies-in-berkeley/