Abstract: This paper is intendto the power system which includes generation, transmission and distribution of the electrical energy. This gives the overview of generation which tells about the recent energy production in the world. It explains about the production of energy and source of energy of top 20 countries in the world, also gives the statistical data about the sources available in India and other countries. The overall electrical energy review in 2015also explained here. Electrical energy transmission tells about the recent trends present in it and transmission development issues also given here. It tells about the future expansion in transmission system and the reason for going into increasing the voltage level high. The investment in the transmission system also explained here. The only one control system for the five national regions of grid is present in Gurgaon it is named as NTAMC. This also explains the energy distribution present in India with the recent technology includes smart grid, SCADA …etc. Additionally it tells about the POSOCO with PGCIL and the improvement in the power system by implementing the smart grid very effectively in India.