83 Ill. Adm. Code 468.110
Maintenance of Records
Section 468.110 Maintenance of Records
The applicant shall agree to adopt and follow procedures
ensuring that documentation regarding the installation of distributed
generation facilities are retained for a period of not less than three calendar
years after the calendar year in which they were created. These records shall
be made available, upon request, to the Commission or its Staff on a
confidential and proprietary basis.