In the past, Farciennes was an industrial city. It declined with the closure of the last Walloon coal mine, namely the Sainte-Catherine shaft of the Roton company, and the fall of the iron and steel industries, formerly large employers in the area between Liège and Charleroi. Today, the site of Roton, of which only the tower and the cloakroom remain, has been developed to accommodate small and medium-sized businesses.
Since the merger of the communes of 1977, the small commune of Pironchamps was integrated into Farciennes. The districts of Wainage, Wairchat and Tergnée were and still are part of the territory of Farciennes.