A joint venture between Mitsui & Co., Marubeni Corp., and SoftBank Corp.'s renewable energy unit won a contract to build transmission lines in Hokkaido to increase wind power capacity in a government pilot project. Eurus Energy Holdings Corp., a Tokyo-based clean energy developer, was chosen for a separate contract for the same project, the Economy, Trade and Industry Ministry said in a statement. "The project is intended to service and identify technical issues in areas that are suitable for wind power generation with weak transmission networks," the ministry said. The ministry will cover half of the total project costs, according to an application for the subsidy issued in September. The ministry has allocated ¥25 billion for the project for the year ending March 31, according to its website. Japan is seeking to diversify its energy mix after the 2011 crisis at the Fukushima No. 1 nuclear power.