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The energy storage system in urban transit systems is able to store and discharge energy at an extremely rapid rate. This enables a complete exchange of energy between vehicles, even when they are not braking and accelerating at precisely the same time, as is most frequently case in everyday service. The energy saving rate is related to the headway. If the headway is long/short, the energy saving goes up/down. When the headway is long, the ESS can save a lot of regenerative energy. The headway of SeoulMetro line 2 is very short in Korea urban transit system. So, the energy saving rate will be very low. If the ESSs are applied to another railway system, we expect that the effectiveness is better than the results of SeoulMetro line 2. This paper presents effects of energy saving and reduction of the CO2-emission by applying the ESS to SeoulMetro line 2.