Prominence Energy has outlined 4,001 Bscf of gross unrisked 2U natural hydrogen prospective resources across 28 Northern Hinge leads in South Australia. The scale is notable, but the portfolio remains undiscovered, permits are still pending and RISC Advisory flagged potentially optimistic trap and seal assumptions.
- 4,001 Bscf of gross unrisked 2U natural hydrogen
- 101.8 Bscf of helium across 28 leads
- Seabrook contains 761 Bscf of 2U hydrogen
- RISC accepted the methodology with reservations
- Mid-2027 drilling depends on permits, funding and approvals
Northern Hinge Adds a Large Prospective Resource Position
Prominence Energy Limited (ASX:PRM) has put a substantial number around its Northern Hinge exploration story, reporting 4,001 Bscf of gross unrisked 2U natural hydrogen prospective resources across 28 leads in South Australia. The assessment also includes 101.8 Bscf of helium and 320 Bscf of petroleum gas, giving the company a sizeable multi-gas exploration portfolio on paper.
Prominence says Northern Hinge ranks among Australia’s largest reported natural hydrogen and helium prospective resource portfolios on a gross unrisked 2U basis. That is a company comparison, not a reserve or production measure: the volumes relate to undiscovered accumulations in four exploration permit application areas, none of which has yet been granted.
Seabrook Emerges as the Lead Drilling Candidate
Seabrook is the largest of the 28 leads, with gross unrisked 2U prospective resources of 761 Bscf of hydrogen, 21.7 Bscf of helium and 363 Bscf of methane. Prominence describes the structure as a priority for further assessment, with interpreted closure, fault-related features and possible gas chimneys identified from the available geological and seismic information.
The lead accounts for about 20% of the Northern Hinge portfolio’s 2U hydrogen and helium resources, according to the company. Around half of the portfolio’s 2U prospective resources sit in the top five leads, which also include Rockford, Flowstone, 581_1 and 581_2. The earlier Eyre resource framework had covered 202.8 Bscf of 2U unrisked hydrogen and 9.2 Bscf of helium, making Northern Hinge the larger addition to Prominence’s South Australian portfolio.
RISC Supports the Methodology but Questions Geological Risking
RISC Advisory independently reviewed Prominence’s lead identification, probabilistic inputs, gas composition assumptions, reservoir parameters and geological risking. It accepted the assessment methodology and inputs as reasonable for a lightly explored frontier area, while stressing that the estimates were generated by Prominence and reviewed by RISC rather than independently calculated by the auditor.
The qualification matters. RISC considered the overall geological chance of success, estimated by Prominence at roughly 6% to 18% across the leads, potentially optimistic, particularly in relation to trap and seal. It regarded charge as the highest-risk geological element and noted uncertainty in the sparse subsurface data. The risked 2U figures are consequently much smaller: 543.8 Bscf of hydrogen, 13.7 Bscf of helium and 53.5 Bscf of petroleum gas.
Mid-2027 Drilling Still Depends on Several Gates
Prominence is targeting a multi-well exploration campaign in mid-2027, following target ranking, updated drilling engineering and cost work, regulatory and environmental preparation, and detailed program design. The company also plans to begin farm-out discussions, potentially reducing its direct capital commitment, although no partnering transaction has been agreed.
The proposed schedule remains conditional on the Northern Hinge permit applications being granted, regulatory approvals, financing and operational readiness. The resource review provides a basis for selecting targets and discussing funding, but it is not a commerciality assessment, reserves certification or project valuation. The next meaningful test of the portfolio will therefore be whether Prominence can convert a technically qualified set of targets into permitted, financed wells.
Bottom Line?
The headline resource is large, but the investment case now turns on permit awards, partner funding and whether drilling can overcome the geological risks RISC identified.
Questions in the middle?
- Will the Northern Hinge permit applications receive government approval in time for the proposed mid-2027 campaign?
- Can Prominence secure a farm-out or strategic partner without materially weakening its exposure to exploration success?
- Will the first wells confirm hydrogen and helium accumulations at commercially meaningful concentrations?