Harbour Energy plc

("Harbour")

Harbour appointed operator of the Zama project in Mexico

31 December 2025

Harbour announces that it has been appointed operator of the Zama oil project offshore Mexico. The appointment was agreed by the Zama partners, including Pemex, Grupo Carso and Talos Energy who will have the option to appoint key personnel into Harbour's project team, and subsequently approved by SENER (Mexico's Ministry of Energy).

The Zama oil field, discovered in 2017 and successfully appraised in 2018 and 2019, is estimated to contain approximately 750 mmboe of gross recoverable resources.  The next step will be to complete engineering and design work in 2026 ahead of a final investment decision.

Gustavo Baquero, Managing Director, Mexico, said:

"Harbour's appointment as operator of the strategically important Zama project is testament to the trust that the Mexican government, including Pemex, places in Harbour and our partners, Grupo Carso and Talos Energy.  Once onstream, Zama will contribute materially to Mexico's domestic energy supply and to Harbour's production levels."

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Notes to editors

Harbour is operator of two significant oil projects in Mexico - Zama and Kan.

Harbour has a 32.22% operated interest in Zama and is partnered with Pemex (50.4%) and Talos Energy Mexico (17.35%).

Harbour is also the operator of the c.150 mmboe gross Kan oil field to the southwest of Zama.  Harbour has a 70% interest in Kan and is partnered with TotalEnergies (30%).

In addition, Harbour recently announced agreement to acquire LLOG Exploration Company, a unique opportunity to secure a fully operated, oil weighted offshore portfolio in the United States.