수소경제 시대에서의 해양에너지 기술이용 방안

Abstract

There is abundant renewable energy in the ocean. The available potential for ocean thermal energy in the low latitude region of tropical and subtropical waters reaches 10,000TWh/ry. Wave energy of 8,000 ~ 80,000 TWh/yr is prevailing in theoceans and high latitude areas while the potential energy of ocean and tidal currents is estimated to be 800TWh/yr. The levelized costs of energy(LCOE) from ocean thermal energy conversion(OTEC), wave energy conversion(WEC) and tidal current turbine(TCT) are estimated to range from $0.21 to $0.651/kWh for 0.5~20MW capacity plants. On the other hand, in order to lower LCOE, it would be necessary to expand the capacity to 2~100MW for meeting the economies of scale. According to Korea’s hydrogen economy roadmap, hydrogen will be produced by fossil fuel and renewable energy to supply for automobiles, ships and trains. Annual demand of hydrogen will reach 194 million ton in 2030, and 526million tons in 2040. The expected price will be reduced to 3,000 won/kg in 2030 and 4,000 won/kg in 2040.