After the Great East Japan Earthquake devastated the Fukushima Daiichi nuclear power plant, many nuclear plants in Japan have been closed and now we depend on fossil fuel. The lack of energy will be better to be compensated by solar power and wind power, which are directly affected by the weather. Therefore, the output remains unstable. This study focuses on the tidal power generation system, which is not much affected by the weather, to build it up as the small hydroelectric system which can generate a stable power. The system is multi-level and each level is a combination of Savonius type hydraulic turbine and Darrieus type hydraulic turbine, which are mostly used in tidal power generation systems. Therefore, we can obtain a stable and more efficient power even at low tidal speed current. We carried out research on efficiency of turbines under low current such as rivers and agriculture canals in order to choose the best type of them.
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