Section 16-11-110 - Adjustment of bills(a) Whenever the test of a meter reveals it to be fast by more than four per cent, the electric company shall refund to the customer such percentage of the total amount of bills covering the consumption indicated by the meter for the previous six months as the meter was found to be in error (see sec. 16-11-120(d) ) at the time of the test, unless it can be shown from the records of either party that the error has existed for a greater or lesser period, in which case the refund shall cover such actual period.(b) No refund shall be allowed in any case if the seal on the customer's meter is found to be broken or if there is any other evidence that the meter has been tampered with.(c) In the event of a nonregistering meter, the customer may be billed on an estimate based on previous usage.(d) If unmetered electricity is used without permission, the customer may be billed on an estimate of the energy consumed.Conn. Agencies Regs. § 16-11-110