A Very interesting product, startup Energyly approached Centroid for its product to be designed. TariffAlarm aims at solving this problem by fixing this gadget between the meter and main switch. The home user can set the number of units say 450 or 470 units. When the consumption reaches the set value, an alarm is raised.

http://timesofindia.indiatimes.com/city/chennai/this-startups-tariffalarm-might-help-you-reduce-power-bill/articleshow/56817060.cms