Section 14(1)(b) in The Tamil Nadu Electricity Supply Code, 2004
(b)For HT services, the due date shall be not less than 7 days from the date of billing. If the last day of the due date happens to be a holiday, the due date shall be extended to till the next working day. 15 days clear notice period shall be allowed prior to disconnection for non-payment. [In case the last day of the notice period happens to be a holiday, the period of notice will get extended and the last day for payment to avoid disconnection will be the next working day.] [Inserted by Commission's Notification No. TNERC/SC/7-4 dated 25.5.2007 (w.e.f.13.6.2007).] Belated payment surcharge shall be levied for HT services during the notice period as specified in this Code.