Conn. Agencies Regs. § 16-50j-41
The Council may at any time initiate investigations and enforcement actions pursuant to Section 16-50u of the Connecticut General Statutes. Orders initiating the investigation shall indicate the nature of the matters to be investigated and shall be served upon any person being investigated. Upon direction by the Council said person shall file with the Council such data, facts, arguments and statement of position as shall be necessary to respond to the inquiry of the Council. The presiding officer may subpoena witnesses and require the production of records, physical evidence, papers and documents to any hearing held in a contested case pursuant to Section 4-177b of the Connecticut General Statutes. A motion for a protective order may be filed with the Council if the Council requests information that may qualify as trade secrets or commercial or financial information as described under Section 1-210(b) of the Connecticut General Statutes, or critical energy infrastructure information.
Conn. Agencies Regs. § 16-50j-41