Information—9 of 2018 66 15.  If— Information stored electronically etc (a) it appears to a public agency that a request relates to information of a kind that is not contained in a written document held by the public agency; and (b) the public agency may create a written document containing information of that kind by the use of equipment that is usually available to it for retrieving or collating stored information, the public agency must deal with the request as if it were a request for a written document so created and the public agency is deemed to hold such a document. 16.  If— Deletion of exempt matter from documents (a) a request is made for access to a document containing any exempt matter; (b) it is reasonably practicable to give access to a copy of the document from which the exempt matter has been deleted; and (c) it appears to the public agency concerned, whether from the particulars of the information specified in the request or after consultation with the person who made the request, that the person would wish to be given access to such a copy, the public agency must give access to the person accordingly. Information provided out of time 17.  Where a public agency fails to provide the person who made the request with the particulars of the information specified in the request within the period prescribed in section 12 or the extended period determined by the Commission in section 18, the information must be provided free of charge by the public agency to the person, and any payment of any charge paid to the public agency must be reimbursed to the person. Extension of time 18.—(1)  The Commission may extend the period prescribed in section 12 if— (a) the request is made to access a large quantity of documents, or necessitates a search through a large quantity of documents, and complying with the prescribed period would unreasonably interfere with the operations of the public agency; (b) consultations are necessary to make a determination on the request; or (c) the information cannot be reasonably provided to the person who made the request within the prescribed period. (2)  Any extension under subsection (1) must be reasonable having regard to the nature of the circumstances and must be for a further period not exceeding 90 days.