Harbour Energy plc announces that it has entered into a Sale and Purchase Agreement to sell its operated interests in the producing Natuna Sea Block A field and the Tuna development project in Indonesia to Prime Group for a cash consideration of $215 million.

The sale is subject to customary regulatory approvals and completion is targeted for Q2 2026.

Steve Cox, Managing Director of Harbour's Indonesia Business Unit, commented:

"This transaction marks a key milestone for Harbour in Indonesia and supports our strategy to focus capital and resources on our most competitive and material opportunities.

"It is also a significant moment for our colleagues in the country, whose hard work and commitment have built Natuna Block A and Tuna into high quality assets over many years. I wish them well as they enter a new chapter under the experienced ownership of Prime Group."

Notes:

Prime Group has upstream and downstream oil and gas businesses in Indonesia, including a 25% interest in the producing Natuna Sea Block B field.

The Natuna Sea Block A sale has an effective date of 1.1.2025 and the Tuna sale will be effective on completion. The consideration is subject to customary completion adjustments.

Harbour has a 28.67% operated interest in Natuna Sea Block A which produced c.4 kboepd (net) in the nine-month period to 30 September 2025. As at year end 2024, Harbour had booked 2P reserves of 7.4 mmboe in relation to Natuna Sea Block A.

Harbour has a 50% operated interest in the Tuna project. As at year end 2024, Harbour had booked 2C resources of 54 mmboe in relation to the Tuna project.

Following completion of the transaction, Harbour will maintain a presence in Indonesia through its interests in the Andaman Sea discoveries.

Houlihan Lokey is acting as sole financial advisor to Harbour on the transaction.

About Harbour Energy

Since its creation in 2014, Harbour has grown to become one of the world’s largest and most geographically diverse independent oil and gas companies.

Today, Harbour is producing between 455,000 and 475,000 barrels of oil equivalent per day with significant production in Norway, the UK, Germany, Argentina and North Africa. Harbour benefits from competitive operating costs and resilient margins, and a broad set of growth options including near-infrastructure opportunities in Norway, unconventional scalable opportunities in Argentina and conventional offshore projects in Mexico and Indonesia.

With low GHG emissions intensity and a leading CO2 storage position in Europe, Harbour remains committed to producing oil and gas safely and responsibly to help meet the world’s energy needs.
Harbour is headquartered in London with approximately 3,400 employees and direct contract staff across its operations and offices.

About Prime Group

Prime Group is a leading integrated oil & gas player with operations across development, production and refining of oil & gas resources in Indonesia.