Partners in Israel 's offshore Tamar natural gas field have signed a $3.5 billion deal to provide gas for 16 years to private power company Dorad Energy.

The deal announced Monday calls for providing 13.2 billion cubic meters of natural gas, although Dorad may buy less depending on its needs, according to a statement from Avner Oil Exploration Ltd. Partnership (AVNRL.TV), one of the Tamar partners.

The Tamar field, which contains about 9 trillion cubic feet of natural gas, is scheduled to begin production next year. Its partners have already signed other supply deals, including one worth $20 billion with the state-run electric company.

Dorad is building a power plant to meet about 8% of
Israel 's electricity needs.

Avner and Delek Drilling Ltd. Partnership (DEDRL.TV), both subsidiaries of Delek Group Ltd. (DLEKG.TV), each hold a 15.6% stake in Tamar. Houston-based Noble Energy Inc. (NBL.NYSE) is the other major stakeholder.

At 1047 GMT, shares of Avner were down 0.048 shekels, or 2.11%, at ILS2.22 ($0.57), and shares of Delek Drilling were down ILS0.22, or 1.71%, at ILS12.61, in a higher Tel Aviv market.