Freecharge: 10% cashback on BESCOM Bill
https://www.freecharge.in/
Use Promocode: BESCOM10

T&C:

Valid on successful BESCOM Electricity bill payment done till 29th Feb 2016 | Valid on minimum bill payment of Rs.300. Max cashback of Rs.100 | BESCOM10 has to be applied to avail cashback offer | Valid once per user/credit/debit card/mobile number | Valid on Credit Card/Debit Card/ NetBanking transactions | Cashback will be credited to your FreeCharge Wallet which can be redeemed within 185 days from date of credit, and is non transferable | Not valid for transactions done via FreeCharge Balance | Virtual Cards & Cards issued outside India will not be eligible for cashback / reward .