The global conflicts and disputes to secure fossil fuels as the major energy sources for the nations have been getting worse in 21st century because of continuously increasing world energy consumption. Also, the pressure to honour the regulations of carbon dioxide emission reduction for the countries and the corporations has been increasing rapidly. Therefore, industrial and economic difficulties of the countries and corporations related to energy are getting serious. Under these circumstances, it is urgent to develop new and renewable energies to overcome difficulties related to energy and to prepare for post-peak oil age. Among various renewable energies, we specialize in wind and tidal powers. We do our best to supply competitive energy production systems for the wind and the tidal power to overcome the limitations of fossil fuels.