[10] In December 2016, Energean acquired 100 percent of the Karish and Tanin natural gas fields from Delek Drilling and Avner Oil for $148 million as required by the Israeli government in order to open the sector to competition.

[11] In March 2018, the company signed a $1.275 billion financing deal with Bank Hapoalim, Morgan Stanley, Societe Generale, and Natixis in order to develop Karish and Tanin.

In November 2019, the company said that its appraisal of the Karish North discovery had revealed 1.2 trillion cubic feet of recoverable natural gas resources plus 34 million barrels of light oil, a significant increase from its original estimate.

46 million barrel of oil equivalent/year) to various Israeli consumers from the field out of the 8 BCM total annual production capacity of its FPSO processing vessel.

In response, Energean denied the claims and asserted that it was the sole owner of the rights to the Karish and Tanin gas fields and that it had acted in complete transparency.