The company's rapid growth brought about the problem of lack of space for the first time and the Winery began its expansion throughout the region. The construction of a wine-aging cellar began in the heart of the mountain holding up the Castle of Peñafiel.

The quality and prestige the Winery acquired in the eighties led a highly recognized vine-growing area to take on its own name, Ribera del Duero, to identify the D.O. Control Board that watches over the quality of area wines. In 1995, the wine-aging cellar was enlarged and the Winery succeeded in the international winemaking panorama.

The project continues growing: In the town of Anguix (Burgos), Protos has acquired a winery that has the latest cutting-edge technology. It can produce up to three million kilos of grapes, of which 1.5 million kilos go through the sorting table.