Who we are
dCarbonX is a pioneering underground energy storage company established to develop assets that enable the Energy Transition.
Based in London & Dublin, dCarbonX uses its proprietary knowledge base to originate and build a portfolio of high-value Energy Transition assets offshore UK and Ireland with a focus on underground energy storage - natural gas and hydrogen, and carbon sequestration.
In November 2021, dCarbonX established a strategic Energy Transition alliance with Snam its main corporate investor and majority shareholder (52.98%).
Snam
80 years experience
ensuring security of supply
Carbon neutral by 2040
commitment to achieve (100%) Carbon neutrality by 2040
Net Zero by 2050
aim for all emmissions
Snam is a leading European operator in gas infrastructure, focusing on transportation, with a network exceeding 40,000 km across Italy and abroad; in storage, holding one-sixth of the European Union's entire storage capacity (around 18 bcm); and in regasification, where it currently ranks as the third largest European player, managing (or co-managing) an annual capacity of 28 billion cubic meters. Snam's long-term ambition is to develop and strengthen energy infrastructure for a sustainable future, positioning itself as a national and European operator and enhancing the role of gas as a key-element for a balanced and secure energy system. Snam is among the top listed Italian companies by market capitalization and is committed to continuous growth in sustainable finance.
With 80 years of experience in building and managing infrastructure, Snam ensures security of supply, helping to increase the system’s resilience to geopolitical instability and, indirectly, to mitigate the country’s exposure to energy market volatility.
In this context, Snam reaffirms its commitment to achieve carbon neutrality (100%) by 2040 and Net Zero for all emissions, including those of associated companies and suppliers, by 2050.
The company's culture focuses on sustainable growth, transparency, valuing new generations, talent and diversity, along with the growth and development of local communities.
Differentiation
Backed by Snam
ensuring security of supply
Efficient low-cost partner
technical partner of choice to deliver economies of scale and affordable energy for communities and industry
Entrepreneurial
adaptive to multiple value realisation paths
Our Team
CEO AND CO-FOUNDER
Tony O'Reilly
Tony O’Reilly is CEO and Founder of dCarbonX, with over 35 years’ C-suite experience. He previously served as CEO of Providence Resources Plc, where he led major transactions with global energy companies. Tony has also held leadership roles at Wedgwood and ARCON (mining), as well as co-founding Zenergy (HTS technology) and Lockwood (funds management).
CTO AND CO-FOUNDER
Angus McCoss
Dr. Angus McCoss is CTO and Founder of dCarbonX, bringing more than 35 years of global oil and gas experience. He has held senior leadership roles at Shell and served as Exploration Director at Tullow Oil Plc, where he led award-winning exploration teams. Dr. McCoss has also served as a director of Ikon Science Ltd and Providence Resources Plc.
COO AND CO-FOUNDER
Dr. John O'Sullivan
Dr. John O’Sullivan is COO and Founder of dCarbonX, with over 35 years’ experience in the energy sector. He has held positions at Mobil, Marathon, and the Marine Institute, and served as Technical Director at Providence Resources plc. Dr. O’Sullivan’s expertise spans both hydrocarbon and renewable energy industries, and he has represented Ireland as the national offshore renewable energy delegate to the International Energy Agency.
BAINS PROJECT DIRECTOR
Ellie Zemani
Ellie Zemani is Bains Project Director at dCarbonX, responsible for overseeing gas storage development. She has held senior roles at Spirit Energy and Centrica, and is a chartered project professional and mentor. Ellie also serves on the Regional Board of North East Scotland College.
DIRECTOR
Piero Ercoli
Piero Ercoli is a Director at dCarbonX and serves as Executive Director International Asset and Business Development at Snam, where he oversees Snam’s international assets and business development activities. Piero began his career as a business analyst at Busacca & Associati, before spending 16 years at Eni Group in senior roles across gas supply, trading, and market strategy in both Milan and London. He joined Snam after his tenure at Eni.
DIRECTOR
Raffaele Cozza D’Onofrio
Raffaele Cozza D’Onofrio is a Director at dCarbonX. He has extensive finance experience in the Italian energy sector, and is a Certified Chartered Accountant and Qualified Auditor. Raffaele joined Snam as Treasury Manager and currently serves as Managing Director of Snam International B.V. in the Netherlands.
DIRECTOR
Maria Antonietta Giannelli
Maria Antonietta Giannelli is a Director at dCarbonX and Director of Mergers & Acquisitions at Snam. She brings over 22 years of international M&A experience at Enel, where she led major deals across Europe and Latin America. Maria later headed M&A at Ferrovie dello Stato S.p.A., the Italian rail company before joining Snam in 2025.
CO SEC & LEGAL COUNSEL
Ross Hood
Ross Hood is Company Secretary and Corporate Legal Counsel at dCarbonX, with 40 years’ experience in energy and corporate law. He has led corporate legal teams at leading Scottish firms and provided advisory services to clients in the natural resources and energy sectors worldwide.
DIRECTOR
Tecla Carrubba
Tecla Carrubba is a Director at dCarbonX and is a Senior Manager at Snam, where she is responsible for the international development of molecular storage projects. Previously, she managed Snam’s hydrogen project development and decarbonization policy business design. Prior to joining Snam, she worked as an energy consultant at Business Integration Partners.
FINANCE LEAD
John Faulks
John Faulks is an FCMA accountant with three decades of experience in energy finance. He has worked for several operators and managed major capital projects, with expertise spanning upstream and midstream roles across Europe, Africa, and the Middle East. John’s responsibilities have included accounting, supply chain, and IT functions.