How it started
History
The Hydro chain was created in the 1980s–early 1990s when Norsk Hydro bought the Mobil stations in Norway, Sweden, and Denmark to transform itself to a vertically integrated petroleum company. The stations were rebranded Hydro in all three countries. In 1994 the Norwegian and Danish stations were converted to Hydro Texaco when Hydro merged its stations in the two countries with Texaco's stations. In 2007 the ownership of Hydro was transferred to StatoilHydro when Norsk Hydro's oil and gas division merged with Statoil. When StatoilHydro was renamed Statoil in November 2009, the use of the Hydro-brand was discontinued, and ownership of 198 filling stations was transferred to St1.
From Wikipedia’s article on Hydro, shared under CC BY-SA 4.0.2