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Delivering GeoEnergy

Developing essential offshore subsurface assets to deliver the Energy Transition

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 technologies and solutions.

Renewable energy systems have a fundamental lack of resilience. A lack of energy storage to handle associated intermittency limits the ability to economically add capacity and thus holds back the Energy Transition. There is a need for sustainable energy system resilience - today and tomorrow.

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

About us

dCarbonX  is a pioneering GeoEnergy company established to develop subsurface assets that facilitate the Energy Transition.  

Based in London & Dublin,
dCarbonX is using its proprietary knowledge base to originate and build a portfolio of high-value Energy Transition assets offshore Ireland & the UK with a focus on energy storage (hydrogen) and carbon capture & sequestration (CCS).  

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Energy Transition

dCarbonXARC- subsurface solutions for decarbonisation


dCarbonX deploys advanced technologies in an innovative GeoEnergy Decarbonisation process using its proprietary Carbon ARC (Avoid – Reduce – Capture) methodology


Avoid - via enabling green hydrogen 


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 and system resilience 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 / hydrogen carriers to complement its drive for a vast wind energy supply to Europe
Specific subsurface sites offshore Ireland & the UK identified for large-scale hydrogen storage & “
security of sequestration” for local small & mid-scale CO
2 emitters


Clean, Green & Unseen


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GeoEnergy Decarbonisation

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

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

dCarbonX has leading subsurface, technical, drilling and business strategic partners in place including AGR (well services / well management), Fugro (environmental / surveys), Stena Drilling (drilling), CGG (reservoirs), Lambert Energy Advisory (corporate) & KPMG (audit).



Customer-facing partnerships & relationships key to securing premium projects

Partner needs are solved through scientific, industrial & business collaboration. Recent Partnerships / Projects include:


Offshore large-scale subsurface storage for green hydrogen with the ESB in Ireland

Carbon Capture & Sequestration in collaboration with Pentair in Ireland & the UK

Proprietary facility-scale cryogenic hydrogen storage for the Invest Northern Ireland-funded Belfast Power-to-X (BP2X) Collaborative Network 

Enabling the Energy Transition together

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Agile, pioneering, subsurface focus


Efficient low-cost operator and technical partner of choice to deliver economies of scale and Affordable Energy for communities and industry

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 served as a non-executive director of the privately funded technology trailblazer Ikon Science Ltd and was senior independent director at Providence Resources Plc. He has a role on the advisory board of the Energy Geoscience Institute, University of Utah, and 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