Existing CCS technology means process for CO₂ capture, transportation and storage. The process of each step spends substantial energy for CO₂ absorption and desorption by chemical and physical absorbent. However, leakage and harmful byproducts from reservoir is main obstacle of this technology. Therefore, biological conversion of CO₂ is now receiving attention. Microalgae are one of the potential conversion agents. Also it is possible to produce bio-products for example biodiesel, carotenoids, proteins, biological active chemicals. BECCS facility integrates bio-energy production and CO₂ treatment, but it is not commercial scale yet. Therefore, this study is carried out providing the fundamental data of LCA and economic feasibility for BECCS technology using microalgae.