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A variety of renewable energy resources are penetrating more into the power grid, in accordance with the efforts to reduce CO2 emission and reduce the dependence on fossil fuels for energy generation. Almost more than 60% of the world’s oil productions are consumed by vehicles on roads. The low efficiency systems that emit several harmful gases are gas driven combustion engines and they start an untenable and inefficient transportation system. In a study, it is reported that vehicles are responsible for 30% of the world total energy consumptions and 27% of total greenhouse gas emissions. The emissions originating from urban life are to be reduced by electric vehicles; the grid-connected vehicles have been proved as one of the effective options for energy conservation. Electric vehicles (EVs) diminish CO2 and NOx releases and upsurge energy efficacy by means of distributed generations (DGs) in the transportation segment. In this paper two case are considered ,first without utility grid connected V2G system and secondly with utility grid connected and with & without V2G what will be the impact of frequency on grid and along with that we have observed the results with different kinds of [7] vehicles i.e. their performance and reliability and it is observed that, with V2G the frequency of the grid improved whenever the load demands the supply, also the use of different charging system how impacts the performance of EV. Hence stability of V2G system by using utility grid gets improved which makes it more efficient than other renewable sources of energy.