Production, transport and assembly of steel structure for a biomass boiler plant with floor plan dimensions of 35.5 x 37.2 m, 43-m high, and the corresponding service steel structures. In essence, the work consisted of replacing all steel structures with new ones, while the supporting reinforced concrete framework of the existing boiler plant was preserved. Part of the work supplied was the manufacturing documentation for the secondary steel structures of railings, floor grates and floor plates.