Japan's three Mitsubishi group companies have signed a contract with state-owned National Gas Company of Trinidad and Tobago Ltd and Massy Holdings to build a methanol producing plant in the Caribbean country for about $1 billion. Mitsubishi Gas Chemical Co, Mitsubishi Corp and Mitsubishi Heavy Industries said they will aim to complete the construction of the plant, capable of producing 1 million tonnes per year of methanol in June 2018, with operations set to start in October that year.