Kalundborg () is a Danish city with a population of 16,211 (1 January 2022), the main town of the municipality of the same name and the site of its municipal council. It is situated on the northwestern coast of the largest Danish island, Zealand (or Sjælland in Danish), on the opposite, eastern side of which lies the capital Copenhagen, away. Kalundborg is famous as the location of a large broadcasting facility, the Kalundborg Transmitter. The city was also home to the largest coal-fired power station in Denmark, the Asnæs Power Station, which started it's transition to biomass in 2017. Kalundborg is mainly a trading and industrial town, but is also well known for its five-spired Church of Our Lady, which is closely associated with King Valdemar I and the Archbishop Absalon. The church itself is said to have been built by Absalon's brother, Esbern Snare. Kalundborg is also the traditional seat of the aristocratic Lerche family. Their stately home, Lerchenborg, the best example of rococo architecture in Denmark, can be seen in the town's outskirts. Ferries connect Kalundborg westward to the island of Samsø. Geography Kalundborg is at latitude 55°41′N, longitude 11°6′E, about west of Copenhagen on the island of Zealand (Sjaelland). History The Kalundborg area was first settled in 1170 at a natural harbour at the head of the narrow bay today known as Kalundborg Fjord. It became more urbanized during the nineteenth century and had grown into a major industrial centre by the mid-twentieth century. Kalundborg Municipality has approximately 20,000 inhabitants, and its network is the most published example of Industrial Symbiosis. The history of Kalundborg Industrial Symbiosis activities began in 1961 when a project was developed and implemented to use surface water from Lake Tisso for a new oil refinery, to save the limited supplies of ground water. The City of Kalundborg took the responsibility for building the pipeline while the refinery financed it. Starting from this initial collaboration, a number of other collaborative projects were subsequently introduced and the number of partners gradually increased. By the end of the 1980s, the partners realised that they had effectively "self-organised" into what is probably the best-known example of Industrial Symbiosis. The material exchanges in the Kalundborg region include: conservation of natural and financial resources; reduction in production, material, energy, insurance and treatment costs and liabilities; improved operating efficiency; quality control; improved health of the local population and public