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The Royal Iron Works were taken over in 1871 by the holding called Vereingte Königs- und Laurahütte AG für Bergbau und Hüttenbetrieb, which added a steel mill, rail mill and workshops. In the vicinity of the Royal Coal Mine, Countess Laura Coal Mine was opened in 1870, and by 1913–1914 coal production increased to 1 million tons a year. In 1898, a thermal power plant was commissioned which was, until the 1930s, the biggest electricity producer in Poland with a power of 100 MW (electrical). Today, it operates as "ELCHO". In 1915, nitrogen chemical works (Oberschlesische Stickstoffwerke) were built nearby to produce fertilizers and explosives by newly invented processes: from the air, water and coal (see Haber-Bosch process). Today, it operates as "Zakłady Azotowe SA".[citation needed]