The slogan, Halden, IT- og Milj�byen (Halden, IT and Environment City), is a reference to Halden's large number of IT companies. In the late 1960s, the most powerful mainframe computer in Norway at the time was located at the Institute for Energy Technology's facilities in Halden. From the 1960s-1980s, Halden was infamous for high levels of industrial pollution, largely originating from the Norske Skog Saugbrugs paper mill (part of Norske Skog since 1989). As a result of projects initiated by both Norske Skog-Saugbrugs and the city authorities, the polluted fjords and rivers of Halden have been cleaned up and the city was dubbed Norway's Environment City in 1996.
One of Norway's two nuclear reactors is located in Halden. The Halden Boiling Water Reactor is a research reactor located 100 metres (328 ft) within M�nefjell, adjacent to the Saugbrugs paper mill. It is in operation about 50% of the time and, in addition to research data, supplies steam to the mill. The reactor is operated by the Institute for Energy Technology, one of Halden's largest employers, and is the largest experimental facility operated for OECD Halden Reactor Project research. IFE's Man-Technology- Organisation laboratory is IFE's other major facility, and was opened by Norway's crown prince regent in March 2004. This new laboratory building houses the most recent incarnations of the Halden Man-Machine Laboratory (HAMMLAB) and Halden Virtual Reality Centre's (HVRC) VR laboratory. The OECD Halden Reactor Project (established in 1958) is one of the world's longest running international research collaborations, with 20 countries participating (2005) and the largest international research project in Norway. This ensures a steady influx of international guest scientists to the city. The fact that Norway has no commercial interest in nuclear power ensures that Halden is viewed internationally as a neutral location. In national politics, the reactor is controversial, however locally it has had
