Qatar's heavy industrial projects, all based in Umm Said, include a refinery with a 50,000 barrels (8,000 m³) per day capacity, a fertiliser plant for urea and ammonia, a steel plant, and a petrochemical plant. All these industries use gas for fuel. Most are joint ventures between European and Japanese firms and the state-owned Qatar General Petroleum Corporation (QGPC). The US is the major equipment supplier for Qatar's oil and gas industry, and US companies are playing a major role in North Field gas development.