 In 1901 Mas was granted a license to exploit waters of the Ter river, flowing through the Northern Catalonia; the business ran into difficulties, was re-defined commercially and continued at least into the early 1910s.It was the most successful of Mas’ projects; on his own real estate Molí de Sau he constructed a hydro power plant; using 15,000 V lines and on a distance of some 13 km it delivered electricity to Vich, where power was further distributed for domestic use via 500 V lines.Railway transport kept Mas busy from the 1880s to the 1900s.