Fremantle Lake
Turquoise waves rolling onto a California-style beach shoreline, seen from above

Geologic Hydrogen Exploration

Geologic hydrogenfor California’sclean energy future.

We are a science-led team working to build a clean, abundant, resilient energy future right here in California.

Request a briefingSee how it works

The mission

We are working to unlock clean energy the earth already makes, and to build it responsibly in California.

Why we exist

The basics

What is geologic hydrogen?

The vast majority of hydrogen today is manufactured from fossil fuels or produced with large amounts of electricity. Geologic hydrogen is different. It forms through natural processes deep underground where water and iron-rich rock formations interact.

Our goal is to gather scientific information, find where hydrogen systems exist, and evaluate the resource potential. We believe new energy resources should be evaluated carefully, transparently, and within regulatory processes, and that is the approach we are taking.

Geologic cross-section beneath the project areaA schematic from the coastal surface down to roughly five kilometers, where the target is deep, hot, iron-rich rock that drives natural hydrogen generation.SurfaceTarget rock: deep, hot, iron-rich

Estimated potential

Why this matters

California needs firm, low-carbon power for homes, industry, and transportation. Geologic hydrogen could be produced close to where it is needed and at a cost that competes with carbon-intensive fuels.

20tons/day per well

First prospect potential

300MW

Clean electricity

$1.75/kg

Targeted cost

~1%

of projected US hydrogen demand, per prospect

Cost per kilogram

Gray hydrogen$1.50–$2.50/kg

Made from fossil fuels. Carbon-intensive.

Blue hydrogen$2.00–$3.50/kg

Fossil-based, with carbon capture.

Green hydrogen$3.50–$6.00/kg

Made by splitting water with renewable electricity.

Geologic (target)~$1.75/kg

Formed naturally underground. Our cost target.

Production-cost ranges from a 2025 peer-reviewed comparison of hydrogen pathways. The geologic figure is our early estimate, not a proven price.

These are early-stage estimates that guide our exploration. They are not proven reserves or confirmed economics.

How we work

A phased program, built to reduce risk

We move one step at a time. Each phase is designed to test our models with rigorous technical data. We move through each project phase gate responsibly.

  1. 01

    Model and target

    Subsurface models and geochemistry point to the most promising locations.

  2. 02

    Acquire data

    We lease mineral rights and acquire geoscience data.

  3. 03

    Drill to confirm

    An exploration well brings geothermal fluids to surface for analysis.

  4. 04

    Pilot and scale

    A pilot verifies the models before commercial production.

Explore our approach

For California landowners

Own land in California? There may be a role for you.

Fremantle Lake CA LLC is actively leasing mineral rights across California. Leasing can create a new income stream from your land while supporting domestic clean energy, with no cost to explore the opportunity.

Learn about leasing

Confidential. No obligation.

Questions

Common questions about the project

Straight answers about geologic hydrogen, the stage we are at, and how to get involved.

What is geologic hydrogen?
Geologic hydrogen is hydrogen gas that forms through natural processes between water and iron-rich rock deep underground. It is not manufactured in a plant and not made using electricity, so producing it can carry a much smaller carbon footprint than other forms of hydrogen.
How is geologic hydrogen different from green or blue hydrogen?
Green hydrogen is made by splitting water with renewable electricity. Blue hydrogen is made from natural gas paired with carbon capture. Geologic hydrogen is produced in the earth, so the focus is on exploration rather than manufacturing. A 2025 peer-reviewed analysis places green hydrogen at roughly 3.50 to 6.00 dollars per kilogram, while geologic hydrogen has the potential to compete with the lowest-cost fuels.
Is geologic hydrogen proven at Fremantle Lake yet?
No. Fremantle Lake is an early-stage exploration project. We are collecting subsurface data and running scientific analysis to reduce technical uncertainty before we make claims about the resource, and we share our progress as we learn more.
How can California landowners get involved?
Fremantle Lake CA LLC is actively leasing mineral rights in California. Landowners can use the Landowners and Leasing page to reach out and discuss your property and whether there might be potential for geologic hydrogen.

Get in touch

Talk with the team

Whether you are an investor, a policymaker, or a landowner, we are glad to share where the project stands and where it is headed.

Contact the teamAbout the project