conference for the mutual exchange of evidence exhibits and
other information. Each interrogatory which requests information
not previously supplied at a prehearing conference or hearing
shall be answered separately and fully in writing under oath,
unless it is objected to, in which event the reasons for the
objections shall be stated in lieu of an answer. The party upon
whom the interrogatories have been served shall serve a copy of
the answers and objections within a reasonable time, unless
otherwise specified, upon the party submitting the
interrogatories. The party submitting the interrogatories may
petition the presiding officer for an order compelling an answer
to an interrogatory or interrogatories to which there has been
an objection or other failure to answer. The commission shall
designate an appropriate official, other than the [Director of
Trial Staff or any other employee of the Office of Trial Staff]
director of the commission's prosecutory bureau or office, on
whom other parties to the proceeding may serve written
interrogatories directed to the commission. That official shall
arrange for agency personnel with knowledge of the facts to
answer and sign the interrogatories on behalf of the commission.
Interrogatories directed to the commission shall be allowed only
upon an order of the commission based upon a specific finding
that the interrogating party is seeking significant,
unprivileged information not discoverable by alternative means.
When participating in a commission proceeding, the [Office of
Trial Staff] commission's prosecutory bureau or office shall be
subject to the same rules of discovery applicable to any other
party to the case.
* * *
§ 510. Assessment for regulatory expenses upon public
utilities.
* * *
(c) Notice, hearing and payment.--The commission shall give
notice by registered or certified mail to each public utility of
the amount lawfully charged against it under the provisions of
this section, which amount shall be paid by the public utility
within 30 days of receipt of such notice, unless the commission
specifies on the notices sent to all public utilities an
installment plan of payment, in which case each public utility
shall pay each installment on or before the date specified
therefor by the commission. Within 15 days after receipt of such
notice, the public utility against which such assessment has
been made may file with the commission objections setting out in
detail the grounds upon which the objector regards such
assessment to be excessive, erroneous, unlawful or invalid. The
commission, after notice to the objector, shall hold a hearing
upon such objections. After such hearing, the commission shall
record upon its minutes its findings on the objections and shall
transmit to the objector, by registered or certified mail,
notice of the amount, if any, charged against it in accordance
with such findings, which amount or any installment thereof then
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