Today, the giant problem of our civilization is the crisis of energy. The conventional energy resources are yet to be replacing by the renewable energy sources due to limited stock and high emission of pollutants. When the world goes for green, the solar energy takes the attention of the researcher. But the state of the art Photovoltaic technology is failed to get the success in cost, efficiency and size point of view. As the wavelength of the sunlight is getting smaller then scaling of the device is necessary to capture the energy from that wave coming. In that case, when size and efficiency both considered in nano-scale, nantenna comes in front of the scientists. In this paper, we mainly focused on the how solar radiation can be transformed to the usable electrical energy using nantenna. Also we have discussed in this paper about several nantenna prototypes available in the market. The nantenna is better than conventional PV technology not only that it produces more than 70% electrical energy but also there are many advantages. This paper completely emphasizes on green energy for the better world and concludes about how efficiency can be increased of the nantenna in the future research.