Ithaca Energy has started production from the company-operated Stella field in the Central Graben area of the United Kingdom Continental Shelf in the North Sea. The field comprises the Stella Andrew sandstone reservoir, containing light oil and rich gas condensate, and the Stella Ekofisk reservoir, containing volatile oil. Discovered by Shell in 1979, the field encountered gas condensate throughout a 25-ft section of Paleocene Andrew sand. Oil was also observed in the underlying Ekofisk chalk reservoir. Ithaca has a 54.66% interest in the field, with Dyas (25.34%) and Petrofac (20%) also holding interests.