The former hydroelectric plant of Giais di Aviano, built at the turn of the twentieth century, is a significant example of industrial archeology. Surrounded by a large park, it is located near the foothills railway (characterized by beautiful stone bridges). In 1908, when it came into operation with two turbines, the Giais power station supplied Udine with electricity with a 45-kilometer line at a voltage of 30,000 volts. In case of breakdowns at the nearby power station, the Giais current could be transmitted to Venice. Its construction is due to the civil engineer Aristide Zenari (Pordenone 1862 - 1944), who was the first to understand the possibility of exploiting the power of the Cellina waters. Noteworthy are the two steel penstocks that fit into the power plant, built by the hydraulic engineer Antonio Pitter (Rorai 1867 - 1936), Zenari's brother-in-law. When the power plant was built, some houses and services were also built next to it for those who worked there. The central chief and some workers lived with their families in these houses.