Section 19(19)(b) in The U.P. Electricity Regulatory Commission (Consumer Grievance Redressal Forum and Electricity Ombudsman) Regulations, 2007
(b)by he distribution licensee and he neglects to,adjust money by revising bill or make payment of money within fifteen days of the order, the distribution licensee shall pay interest at the rate of sixteen per cent compounded half yearly for such period during which default continues.