The Płock refinery is a large oil refinery and petrochemical complex located in Płock, Poland. It is owned by PKN Orlen, and is one of the two major crude oil refineries in Poland, the other one is Gdansk refinery. The refinery has a Nelson complexity index of 9.5 and a capacity is 16.3 million tonnes per year or 276,000 barrels per day of crude oil.
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Płock (pronounced [pwɔt͡sk] ), officially the Ducal Capital City of Płock, is a city in central Poland, on the Vistula river, in the Masovian Voivodeship. According to the data provided by GUS on 31 December 2021, there were 116,962 inhabitants in the city.
Płock is a seat of the county (powiat) in the west of the Masovian Voivodeship. From 1079 to 1138 it was the capital of Poland. The Cathedral Hill (Wzgórze Tumskie), along with Płock Castle and the Catholic Cathedral containing the sarcophagi of some Polish monarchs, is listed as a Historic Monument of Poland. It was the main city and administrative center of Mazovia in the Middle Ages before the rise of Warsaw, and later it remained a royal city of Poland. It is the cultural, academic, scientific, administrative and transportation center of the west and north Masovian region. Płock is the seat of the Roman Catholic Diocese of Płock, one of the oldest dioceses in the country, founded in the 11th century, and it is also the global headquarters for the Mariavite Church. Poland's oldest school and largest oil refinery are located in Płock.