
The energy and natural resources practice at William Fry LLP offers ‘significant levels of energy expertise and experience’, particularly on pressing and sector-critical matters. An energy regulation expert, practice co-head Fergus Devine is a leading advisor to asset managers and the transmission service operator on impactful topics including the stability, security, and transition of the energy sector. Máire O’Neill also co-heads the team, assisting with the corporate aspects of energy procurement and project investment mandates. A further key contact is projects expert Jarleth Heneghan, who advises on procurement and construction matters concerning power assets, manufacturing facilities, and data infrastructure.
Testimonials
Collated independently by Legal 500 research team.
‘In addition to being very knowledgeable and providing excellent practical advice, the team is incredibly responsive and active, allowing them to meet the fast-moving nature of projects, the changing regulatory landscape and the regular flow of stakeholder inputs.’
‘The team is very knowledgeable in relation to the intricacies of the Irish energy market. They are very client-centric and responsive.’
‘The strength in depth within the team stands out, offering significant levels of energy expertise and experience.’
- ‘All of the team have the ability to understand complex issues whilst explaining the legal and regulatory requirements.’
- ‘Fergus Devine is peerless within the area of energy and natural resources law. He provides timely, practical, and refined advice that sets him apart and manages do so efficiently, proactively and in a manner tailored to our particular needs and role. His manner and collegial approach enable us to achieve best results whilst maintaining and fostering relations with stakeholders and customers.'
- ‘Máire O'Neill is one of the most diligent lawyers that we work with. She is all over the detail and turns complex work around in a timeframe that would be challenging for virtually all other lawyers.’
- 'Colm Booth provides excellent client service and a particular attention to detail. His level of sectoral knowledge is well beyond his years and we have comfort in dealing with him on all topics.’
Key clients
- AIB plc
- AVK
- Aughinish Alumina
- Bord na Móna
- Brookfield Renewable Energy Partners
- Certa Ireland
- Copenhagen Infrastructure Partners
- Dasos Foaraois Management Limited
- DCC plc Energy Division
- DECC - Department of Energy, Climate & Communications
- DIF Capital Partners
- Digital Realty Trust
- Echelon Data Centres
- EirGrid plc
- Elecnor
- Element Investments
- EngineNode
- European Investment Bank
- FuturEnergy
- Gaeltec Utilities Limited
- Gresham House Asset Management
- IBM
- Irish Life Assurance Plc
- Jolt Energy Holdings
- Lightsource BP
- Silicon Valley Bank
- Skyborne Renewables Offshore Solutions Gmbh
- SSE plc
- SuperNode Limited
- Suretank Group Limited
- Yuno Limited / Prepaypower Limited
- Valero Energy Ireland
- Voltalia
- Weener Plastics
Work highlights
- Advised EirGrid on its successful procurement of 660MW of new dispatchable temporary emergency generation (TEG) services to support Ireland's energy transition.
- Advised Echelon Data Centres on Starwood Capital's $850 million investment in the company.
- Advising Copenhagen Infrastructure Partners in relation to its participation in a 500MW offshore wind farm project.
Lawyers

Practice head
The lawyer(s) leading their teams.
Fergus Devine, Máire O'Neill