The North American Board of Certified Energy Practitioners (NABCEP) has become the primary certification entity for the solar industry and they continue to add more certifications. There is continued debate online about the value of the certifications.
Some states are now requiring NABCEP certification, NOT to pull permits, but to apply for incentives that are as critical as permits to completing a project. You can get more information on incentive programs through:
Database of State Incentives for Renewables & Efficiency (DSIRE)
Interstate Renewable Energy Council (IREC) Solar Licensing Database
Most solar industry professionals who I’ve spoken with have an opinion about NABCEP certification. Here are some of the comments I’ve collected.