It was street lighting that initially consumed virtually the entire supply of coal gas, known as ‘lighting’ gas, produced by the degassing of hard coal, i.e. its thermal decomposition at a temperature of around 1,000 degrees Celsius, without any air supply. Soon, however, gas also began to be used increasingly in homes and public buildings, including for heating water or space heating. Within three decades, the demand for the raw material in the city of more than 300,000 inhabitants had increased so much that it became necessary for the Prussian company to build another, much larger plant.
Construction of the Warsaw Gasworks, then known as the Gas Plant (Zakład Gazowy), began in 1886 at what was then Dworska Street (now Kasprzaka Street), on still empty land beyond the city’s tollgates. Connected by a five-kilometre-long gas pipeline to the plant on Ludna Street, the gasworks went into operation two years later. The complex initially consisted of a metering apparatus plant, a desulphurisation plant, a water tower, a boiler and furnace plant (now defunct) and a rotunda housing a metal gas tank, which was elevated over time. A chemical factory was built in 1892–93 to process gasworks by-products, above all gas tar into coke, and a second rotunda was added in the early years of the 20th century to cover the gas reservoir, and new boiler plants and staff housing were built.