What Santos's Additional 3.3% Papua LNG Interest Acquisition and ExxonMobil Operatorship Change Mean for the Project

Nitish Kishor

29 September 2026 11:51 PM AEST

What Santos's Additional 3.3% Papua LNG Interest Acquisition and ExxonMobil Operatorship Change Mean for the Project

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Santos Limited (ASX:STO) announced on 7 September 2026 that it has executed a binding agreement to acquire an additional 3.3% participating interest (post State back-in) in PRL15 and the Papua LNG project from TotalEnergies, for consideration of approximately US$189 million. The Acquisition is conditional on regulatory approvals and the Papua LNG project achieving Final Investment Decision, planned for Q4 2026. Upon completion, Santos's participating interest in Papua LNG will increase from 17.7% to 21%, and Santos's Equity LNG production from the project is expected to increase approximately 19% to approximately 1.2 Mtpa. The announcement was made concurrently with TotalEnergies' agreement to transfer operatorship of Papua LNG to ExxonMobil PNG Antelope Limited.

Transaction Details

Santos has agreed to acquire 3.3% of the participating interest in PRL15 and the Papua LNG project from TotalEnergies for approximately US$189 million. The acquisition will increase Santos's PI from 17.7% to 21.0% (post State back-in). The acquisition is effective from 1 January 2026 (economic effective date). Completion is conditional on regulatory approvals and the Papua LNG project achieving FID, planned for Q4 2026. The transaction is part of a broader restructuring in which TotalEnergies is also selling participating interest proportionally to other JV partners. ExxonMobil PNG Antelope Limited will assume operatorship of the Papua LNG project — the same company that currently operates PNG LNG. Santos expects ExxonMobil's dual operatorship of PNG LNG and Papua LNG to deliver operational synergies and strengthen project execution.

Papua LNG JV Structure Post-Transaction

Following the transaction, Santos will hold 21.0% (post State back-in) in Papua LNG. ExxonMobil's interest will be 28.7% or higher (it is also receiving a proportional allocation of TotalEnergies' sell-down). Papua New Guinea's State entity will retain its back-in rights in accordance with the applicable agreements. Santos acknowledged and thanked TotalEnergies for their decade-long efforts in advancing Papua LNG to its current state of readiness for FID.

Strategic Rationale

Santos Managing Director and CEO Kevin Gallagher described Papua LNG as a world-class development, strategically positioned to Supply premium Asian markets and offering multiple value streams. The acquisition aligns Santos's interests across PNG LNG and Papua LNG ahead of the planned FID. The Papua LNG project is expected to provide reliable, low-cost production, with the acquisition consistent with Santos's Capital allocation framework targeting a free Cash Flow breakeven oil price of $45-50/bbl. As Barossa gas and Pikka oil projects move into operations, Papua LNG positions Santos for the next phase of value-accretive growth.

About the Company

Santos Limited is one of Australia's largest oil and gas producers, with operations across Australia (Barossa, Cooper Basin, Northern Australia), Papua New Guinea (PNG LNG), the United States (Pikka, Alaska), and internationally. The company is a major LNG producer and is advancing multiple major projects toward production.

Risks

The acquisition is conditional on Papua LNG achieving FID in Q4 2026. If FID is delayed or does not proceed, Santos would not be obligated to complete the acquisition at US$189 million.

Papua LNG is a large, technically complex onshore LNG development in Papua New Guinea, where project execution risk — including construction, community relations, and logistics — is material for a project of this scale.

Santos is investing US$189 million (approximately A$270 million) for a 3.3% interest increase at a time when the company is also funding Barossa and Pikka. The combined capital programme is substantial.

Papua New Guinea regulatory and political environment requires ongoing government and community engagement. State back-in rights add complexity to the project ownership structure.

LNG market conditions in Asia — the primary market for Papua LNG gas — are subject to price fluctuations, competition from other LNG sources (US, Qatar, Australia), and Demand variability from Asian buyers.

What to Watch Ahead

Papua LNG FID announcement, planned for Q4 2026 — this is the trigger event for completion of the Santos acquisition and the start of the development phase.

Regulatory approvals for the PI transfer from TotalEnergies to Santos and the other JV partners, including any Papua New Guinea government requirements.

Barossa gas project and Pikka oil project ramp-up progress, which CEO Gallagher referenced as moving into operations and providing the cash flow foundation for the Papua LNG investment.

ExxonMobil's assumption of Papua LNG operatorship and any announcements of operational synergies with PNG LNG, which operates successfully under ExxonMobil.

Santos's updated capital allocation guidance following the Papua LNG transaction, to understand how the additional US$189 million commitment is funded.

FAQs

Q: What is Papua LNG and how does it differ from PNG LNG?

A: Both projects are in Papua New Guinea but are distinct. PNG LNG is an existing, producing LNG project operated by ExxonMobil since 2014, in which Santos holds a 13.5% interest. Papua LNG is a separate, adjacent LNG project under development based on the PRL15 licence — the same gas fields that TotalEnergies has been developing and in which ExxonMobil will now take operatorship. Papua LNG's gas will be transported via a pipeline and processed at a new or expanded LNG facility. The two projects share geographic proximity and will now share the same operator (ExxonMobil), which is expected to deliver synergies.

Q: What is a 'State back-in' and how does it affect Santos's interest?

A: In many Papua New Guinea petroleum agreements, the PNG State has a right to 'back-in' to a specified percentage of the project at or after FID — paying for its share of past costs on commercial terms. Santos's interest of 21.0% is stated 'post State back-in,' meaning it is the interest Santos will hold after the State exercises or does not exercise its back-in rights. The pre-back-in interest is slightly higher. This is a standard feature of PNG petroleum contracts that the government uses to ensure local participation in major resource developments.

Q: Why is ExxonMobil becoming operator of Papua LNG?

A: TotalEnergies previously held operatorship of Papua LNG as part of its leadership of the project's development phase. Under the restructuring, ExxonMobil PNG Antelope Limited — a subsidiary of ExxonMobil that also operates PNG LNG — will take over as operator. ExxonMobil's proven track record in PNG LNG (which has been producing since 2014) and the geographic and operational overlap between the two projects are expected to deliver synergies in project management, contracting, logistics, and operations. Santos specifically cited this as a positive for project execution.

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