(220 ILCS 5/9-252.1)
Sec. 9-252.1.
When a customer pays a bill as submitted by a public utility
and the billing is later found to be incorrect due to an error either in
charging more than the published rate or in measuring the quantity or volume of
service provided, the utility shall refund the overcharge with interest from
the date of overpayment at the legal rate or at a rate prescribed by rule of
the Commission. Refunds and interest for such overcharges may be paid by the
utility without the need for a hearing and order of the Commission. Any
complaint relating to an incorrect billing must be filed with the
Commission no more than 2 years after the date the customer first has knowledge
of the incorrect billing.
(Source: P.A. 88-323.)
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