Yes, there are two requirements for distributed generation installation in Illinois. The first is a company level requirement that Distributed Generation Installers be certified by the Illinois Commerce Commission (ICC). Details of this requirement can be found at the ICC’s Distributed Installers page. A list of Certified Distributed Generation Installers can be found here. Any questions about this requirement should be directed to the ICC which oversees this program.
Additionally, installation of a solar photovoltaic system, if it will seek a REC contract under the Adjustable Block Program, must be done by a Qualified Person as defined under 83 Ill. Adm. Code § 468.20, which covers the qualifications required of the individuals who are actually installing the system.