PSI is the 23rd letter in the Greek alphabet and is the name of Peter Sisseck's (of the coveted Pingus and Flor de Pingus) utopian wine from Ribera del Duero. Peter has sought out the best independent vineyard growers in Ribera and is incentivizing them to improve viticultural practices and shun chemicals, lower yields and practice biodynamics by paying them increasingly for the fruit as they improve. The result is a "give back" to the region wine that also expresses the "soul" of Ribera.
In 2020, he reached the target he set for himself when PSI first started, to produce around 300,000 bottles (it's actually 350,000 bottles). The volume of the 2020 PSI is something that's important, as it has availability and affordability, which is necessary when based on quality, purchasing only grapes from old vines (they use 7,000 plots for this volume!). So, they also started purchasing some of those vineyards in 2022 (they think they need 200 hectares to keep the volume, so the aim is to own maybe half of it). Peter Sisseck remarked that we have to remember 2020 was a warm year, but with the high content of limestone in the soils, the wine has kept very good freshness. The bottled wine has all that the sample promised—clean and healthy aromas, floral and elegant, aromatic and with good freshness.