Originating & building a risk-managed portfolio of

high-value offshore subsurface assets

Business case

There is growing global momentum in the transition from fossil fuels to renewable energy. Achieving the Energy Transition will require fit for purpose energy infrastructure and the development and adoption of innovative new technology and solutions.

There is a fundamental lack of resilience in renewable energy systems. A lack of energy storage to handle associated intermittency will limit the ability to economically add capacity and thus, the
Energy Transition. There is a need for sustainable energy system resilience - today and tomorrow.

dCarbonis an asset-focused GeoEnergy company established to solve these global problems through baseload subsurface solutions.

About us

dCarbonX is a pioneering private company that innovatively develops subsurface energy storage, carbon sequestration and geothermal assets to facilitate the Energy Transition.  
dCarbonX is originating and building a portfolio of high-value offshore subsurface GeoEnergy assets, deploying advanced technologies in an innovative process known as GeoEnergy Decarbonisation using its proprietary Carbon ARC
(Avoid – Reduce – Capture) methodology.

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Energy Transition

dCarbonXARC’ subsurface solutions for decarbonisation


Avoid - via enabling green hydrogen & harnessing geothermal 


Reduce - via strategic & scalable integrated hydrogen storage


Capture - via permanent subsurface disposal of CO2


GeoEnergy Decarbonisation

dCarbonX aims to bring low-carbon security of energy supply to Ireland & the UK via its first-mover position utilising offshore GeoEnergy solutions

Ireland has an acute need for low-carbon GeoEnergy solutions, particularly for subsurface energy storage of hydrogen to complement its drive for a vast wind energy supply to Europe

Specific subsurface sites offshore Ireland & the UK for large-scale storage & sequestration

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GeoEnergy Decarbonisation

Ireland & the UK are committed to the Energy Transition and are ideal investment environments

dCarbonX directors have unmatched proprietary operational experience in offshore Ireland / UK

dCarbonX has strong subsurface technical, drilling and business partners in place


Customer-facing partnerships & relationships key to securing premium projects

Partner needs are solved through scientific, industrial & business collaboration


Enabling the Energy Transition together

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Agile, pioneering, subsurface focus


Efficient low-cost operator & technical partner of choice

Access to Energy Transition capital – to share risks & rewards

Entrepreneurial - adaptive to multiple value realisation paths

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Our uniquely experienced team

Dr John O'Sullivan (left)

Tony O'Reilly (centre)

Dr Angus McCoss (right)


Dr. John O’Sullivan (left) is COO and a Founder of dCarbonX. John holds three degrees in Geology and Geophysics as well as a Masters Degree in Technology Management. John is also professionally chartered by the Geological Society of London and a member of the International Geothermal Association. He has more than 30 years of experience in the energy arena having previously worked with Mobil, Marathon, Marine Institute and Providence Resources plc where he served as the Technical Director from 2010-2019. He has worked across both the hydrocarbon and renewable sectors in oil/gas, offshore wind/wave, geothermal, gas storage and carbon capture/sequestration. John has chaired and participated in a number of Irish government-funded SME/start-up RTDI high technology enterprise investment programmes and was Ireland's national offshore renewable energy representative at the International Energy Agency.

Tony O’Reilly (centre) is CEO and a Founder of dCarbonX.  A graduate of Brown University, Tony has 30 years C-suite experience ranging from large, multi-site international businesses to start-ups in industries ranging from oil and gas exploration to mining, to consumer media and luxury goods, to environmental technology and financial services.  As founder and CEO of Providence Resources Plc, Tony led the Company into major commercial transactions with leading energy players including ExxonMobil, Eni, Petronas, Total, Chevron and Chrysaor.  Prior to Providence, Tony was the CEO of Wedgwood and prior to that was Chairman and CEO of ARCON.  Tony was also co-founder of two start-ups, Zenergy and Lockwood, which were respectively involved in high temperature superconductivity (HTS) technology and funds management.

Dr. Angus McCoss (right) is CTO and a Founder of dCarbonX. He has two degrees in Earth Sciences, including a BP sponsored PhD from Queen’s University Belfast. Angus pursued a 20-year international career in Shell, gaining considerable oil & gas business experience in Europe, China, the Middle East, North and South America, and Africa. Roles at Shell ranged from R&D leader, to business developer and regional vice president of exploration. He joined the board of Tullow Oil plc in 2006 as Exploration Director where he led an industry-acclaimed team that innovatively discovered several new oil basins in Africa and South America. Angus also had a role on the advisory board of the Energy Geoscience Institute, University of Utah, and served as a non-executive director of the privately funded technology trailblazer Ikon Science Ltd and senior independent director at Providence Resources Plc. He has recently founded the Sustainable Earth Scientist international collaboration platform for students to constructively explore solutions for the Energy Transition and Climate Change.


Contact us: info@dcarbonx.com

© 2021 dCarbonX Ltd