Impact of battery and hydrogen co-firing technology under high penetration of renewable energy is discussed in this paper. Today, management of surplus electricity from renewable energy is becoming an important issue for establishing a low carbon society. For managing surplus electricity from domestic renewable energy, we evaluate the co-firing technology which is premised on utilizing imported hydrogen. The optimization of energy model incorporating battery and hydrogen co-firing is used for economic impact evaluation. Optimized results suggest that utilization of both technologies reduces the total cost of electricity and further lower the limit of CO
2 emissions. From the sensitivity analysis under 100gCO
2/kWh as emission factor constraint, the efficiency of gas fired power plant shows relatively high sensitivity by increasing the overall efficiency of co- firing. It is also suggested that levelized cost of electricity (LCOE) is insufficient and overall system evaluation is essential for impact evaluations of energy storage technologies.
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