[4] 20th century to today The industrial chemical plant of Pieve Vergonte was founded in 1915 on the initiative of the Italian Society of Explosive Products (PETS), based in Milan, with 2,500,000 lire of capital.

[clarification needed] During World War II, the chloralkali process, sulfuric acid, and fertilizers were produced.

The ANIC, then EniChem, DDT plants ran until June 1996 and remained in production until their sale on July 1, 1997, to Tessenderlo, Italy.

The largest producer is the Edison Company, with plants in Val Anzasca and Pieve Vergonte, both fed by the waters of the river Anza, with a total average production of 95 GWh.

The second-largest producer is Tessenderlo's Battiggio plant, ex-Rumianca of Ceppo Morelli in Val Anzasca, on the Toce river at Megolo, which has a total average production of 90 GWh.