Key Highlights

  • Prominence Energy (ASX:PRM) announced maiden gross unrisked 2U Prospective Resources of approximately 4 trillion standard cubic feet (Tscf) of natural hydrogen across 28 exploration leads at Northern Hinge on 22 October 2026.
  • The assessment also identified approximately 101.8 billion standard cubic feet (Bscf) of helium and 320 Bscf of petroleum gas, with independent technical review supporting the resource estimation methodology while identifying geological uncertainties.
  • The company is targeting a multi-well exploration drilling programme for mid-2027, subject to exploration permit grants, regulatory approvals, financing and the outcome of its proposed farm-out process.

Prominence Energy Limited (ASX:PRM) is an Australian-listed exploration company focused on natural hydrogen and helium opportunities in South Australia. On 22 October 2026, the company announced maiden Prospective Resources at its Northern Hinge Project, identifying approximately 4 Tscf of gross unrisked natural hydrogen across 28 leads. The announcement expands the company's estimated exploration potential alongside its existing Eyre Peninsula assets. However, these volumes represent undiscovered resources rather than confirmed gas accumulations, and further exploration will be required to establish whether the identified geological structures contain commercially recoverable hydrogen.

What Does the Northern Hinge Resource Assessment Reveal?

Prominence Energy (ASX:PRM) reported gross unrisked 2U Prospective Resources of 4,001 Bscf of natural hydrogen across 28 leads within its Northern Hinge exploration area.

The assessment also included approximately 101.8 Bscf of helium and 320 Bscf of petroleum gas.

The estimates cover four petroleum exploration licence application areas: PELA 566, PELA 581, PELA 752 and PELA 753.

These permit applications remain subject to formal grant, meaning exploration activities cannot proceed across the relevant areas until the necessary tenure and approvals are secured.

The company developed its resource estimates using available geological and geophysical information, including structural interpretations and assumptions concerning potential gas accumulations.

The 2U classification represents the best estimate of potentially recoverable volumes from undiscovered accumulations.

However, Prospective Resources are distinct from reserves because neither the existence of commercially recoverable gas nor the feasibility of production has been demonstrated.

How Significant Are the Risked Hydrogen Resource Estimates?

The headline estimate of 4,001 Bscf represents gross unrisked 2U Prospective Resources.

Prominence Energy (ASX:PRM) also reported gross risked 2U hydrogen resources of approximately 543.8 Bscf.

The difference reflects geological uncertainty associated with whether gas accumulations exist within the identified leads.

The company's assessed geological chance of success ranges from approximately 6% to 18% across the portfolio.

These probabilities consider geological factors such as reservoir presence, gas charge, trap development and the effectiveness of geological seals.

The risked estimate provides a probability-adjusted assessment of exploration potential rather than confirmation of recoverable gas.

Even where geological conditions appear favourable, drilling is required to establish whether a prospective structure contains hydrogen and whether its characteristics could support commercial development.

What Did the Independent Technical Review Establish?

The Northern Hinge resource estimates were reviewed by RISC Advisory, which assessed the company's methodology, geological assumptions and resource estimation inputs.

The review found the overall estimation approach reasonable for the available geological information.

However, the assessment also identified uncertainties relating to the geological risking applied across the leads.

In particular, assumptions concerning trap and seal effectiveness were considered potentially optimistic.

Gas charge was identified as a significant geological uncertainty because the presence of suitable structures does not independently confirm that sufficient hydrogen has accumulated within them.

The review therefore supports the methodology used to assess exploration potential but does not establish the commercial viability of the project.

The resource estimates were prepared by Prominence Energy (ASX:PRM) and independently reviewed rather than independently generated.

Why Is the Seabrook Lead Important to Northern Hinge?

The Seabrook lead, located within PELA 753, represents the largest individual hydrogen target identified in the Northern Hinge assessment.

Prominence Energy (ASX:PRM) reported gross unrisked 2U Prospective Resources of approximately 761 Bscf of hydrogen and 21.7 Bscf of helium at Seabrook.

The hydrogen estimate accounts for approximately 19% of the project's total gross unrisked 2U hydrogen resources.

Geological interpretation suggests the lead may be associated with fault-related structures capable of forming potential gas traps.

However, these interpretations are based on existing subsurface information rather than direct confirmation through exploration drilling.

Further geological assessment will be required to establish the structure's characteristics and determine whether it should be prioritised for drilling.

Other identified leads, including Rockford and Flowstone, form part of the company's broader evaluation programme.

How Does Northern Hinge Compare With the Eyre Project?

Prominence Energy (ASX:PRM) previously announced a Prospective Resources assessment for its Eyre Project in South Australia on 14 September 2026.

That assessment identified gross unrisked 2U Prospective Resources of approximately 202.8 Bscf of hydrogen and 9.2 Bscf of helium.

The Northern Hinge estimates therefore represent a substantially larger reported volume of potential hydrogen resources.

Together, the projects form part of the company's broader South Australian exploration portfolio, covering approximately 64,000 square kilometres.

The company intends to use the resource assessments to evaluate geological targets and inform future exploration planning.

However, differences in estimated volumes do not necessarily establish differences in commercial value.

The technical characteristics, exploration risks, permitting requirements and development costs of each project will influence future decisions.

What Are the Company's Drilling Plans for 2027?

Prominence Energy (ASX:PRM) is targeting a multi-well natural hydrogen and helium exploration programme during mid-2027.

The company has outlined several activities required before drilling can commence.

These include further geological interpretation, exploration target ranking, updated drilling cost assessments and detailed well planning.

Engineering and drilling programme design activities are planned for November and December 2026.

The company also intends to progress farm-out discussions to identify potential exploration partners.

A farm-out arrangement could involve another company contributing funding toward drilling expenditure in exchange for an interest in the relevant project.

However, no completed farm-out agreement or fully funded drilling programme has been confirmed.

The proposed drilling timetable remains dependent on permit grants, regulatory approvals, financing and operational readiness.

What Are the Main Exploration and Funding Risks?

Prominence Energy (ASX:PRM) remains exposed to substantial geological uncertainty because the Northern Hinge resource estimates relate to undiscovered accumulations.

The geological chance of success across the identified leads ranges from 6% to 18%, highlighting the uncertainty associated with potential discoveries.

The effectiveness of geological traps and seals remains an important technical consideration.

The four Northern Hinge exploration permit applications have not yet been granted, introducing uncertainty regarding when exploration activities can commence.

Financing is another consideration because a multi-well drilling programme would require capital expenditure before any potential commercial production.

Although farm-out discussions may provide a funding pathway, completion of an agreement is not assured.

The company must also undertake further technical work before identifying drill-ready targets.

What Are the Next Milestones for Prominence Energy (ASX:PRM)?

The immediate priorities include progressing exploration permit applications and refining the geological understanding of Northern Hinge.

Updated drilling cost assessments and detailed engineering work are expected to support the company's preparation for its proposed mid-2027 exploration campaign.

Further announcements concerning the ranking of exploration leads could indicate which targets are being considered for initial drilling.

Progress on farm-out negotiations will also be relevant to the company's ability to finance exploration.

The company's next major operational milestone would be the commencement of drilling following receipt of the required approvals and funding.

Ultimately, exploration results will determine whether the estimated Prospective Resources can progress toward confirmed discoveries and more detailed development assessments.