Renewable energy technology (RET) is gaining too much popularity now a day as these are considered as best replacement for fossil fuel based energy. Specially wind and solar energy gained much attention in developed as well as in developing countries. But one should also consider that these sources are not continuous, solar radiation is available at most 10 hours a day and wind also depends on particular geographical location. Due to their variable nature operator need to store energy from these sources so that power demand can be met during peak hours. But now during power oversupply, operators curtail these resources. The curtailment rates are expected to increase in future as RET shares increasing continuously.
Instead of curtailment one can store the energy but it is seen that storage is not as favourable as curtailment. So we suggest that instead of curtailment and storage in conventional electro-chemical battery system one should go for electricity storage in form of hydrogen. For this electrolysis is the best way. In this paper we will review the hydrogen production by electrolysis and its use in RET.