This paper will discuss about design of consumer participative device for smart grid initiative. Indonesia condition is taken as the case, because smart grid initiative will depend on object and environment condition. It is found that electricity provider has difficulties to provide Advance Metering Infrastructure (AMI), and that will be the area where consumer most probably be able to contribute for smart grid. As consumer device, it should be designed to give additional benefits for consumer at affordable cost. Functionality requirements of the device for customer benefits are mapped. A smart metering device is designed and proposed, which has capability to collect data and report to electricity provider via IP network, without interfering existing provider's traditional meter. It is based on a low cost microcontroller with GSM/GPRS communication capability and optional autoswitch function to alternative source of energy. The experiment is done by making the device prototype. It shows that customer benefits and cost constraint can be achieved with proper design of the device, to make feasible this consumer participative device concept for smart grid initiative.