Feilim O’Caoimh | Fieldfisher
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Professional background

Professional background

I am a commercial lawyer with over 20 years’ experience advising international and domestic clients on commercial contract arrangements, and have earned a name as a leading individual in the field of renewable energy development.

As head of Fieldfisher LLP (Ireland)’s Corporate and Renewable Energy Unit, I advise commercial clients on all aspects of their business arrangements.  I also lead our Renewable Energy offering, and have particular experience in the areas of wind energy (both onshore and offshore), solar, energy storage and biomass. 

I have extensive experience in commercial contracts, outsourcing arrangements, shareholder arrangements, corporate governance, M&A transactions and venture capital transactions. 

I have particular expertise in the area of renewable energy where I advise on project finance, energy regulatory issues, project sales and acquisitions, and joint ventures. My team has also won a number of awards for advice in the renewable energy sector including 'law firm of the year' in the 2017 Corporate INTL Global Awards.

I seek to gain a clear understand my clients’ businesses so as to put myself in the best position possible to provide them with practical and commercial ‘real world’ advice.

I strive to communicate in clear and unambiguous language. I never sit on the fence.

My experience as a commercial lawyer focusses on medium and large corporates operating domestically and internationally in sectors such as retail, manufacturing, technology, digital services, logistics and security.

My experience in the Renewable Energy sector sees me advise banks, developers (both private and semi-state), investors and other key stakeholders operating in the market. 

The transactions I lead regularly require input from experts across the firm. This involves careful team management across the various disciplines involved, in many cases including our experts in data protection, employment and property.  My routine is to establish clear and regular reporting lines so that all team members understand roles, responsibilities, deadlines and most importantly of all, the client’s objectives.

Awards & recognition

Awards & recognition

Chambers Europe 2024

"Feilim O'Caoimh is reliable and provides robust advice."

Chambers Europe 2023
He knows his stuff when it comes to the commercial aspects, what's the market norm and what we need.
Chambers Europe 2022
Feilim O’Caoimh handles corporate and asset transactions as well as joint ventures, with a particular focus on wind energy projects. Clients say: "He is very commercial and brings a huge amount of experience, so he is not just theoretical - he solves problems and is a good negotiator."

Authored pieces

All Resources
A scientist wearing blue gloves is placing a small vial into a machine filled with multiple vials in a lab. The setting is brightly lit and appears sterile, emphasizing the scientific nature of the work being conducted.
Corporate and Commercial
Insight

Fieldfisher Ireland advises Lisnabrin Engineering on sale to Kaleidex Group

28.08.2026
Fieldfisher Ireland has advised Lisnabrin Engineering Limited on its sale to Kaleidex Group, as part of Kaleidex’s largest acquisitions to date and its strategic expansion into Ireland.
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A group of people poses for a photo in an office decorated with Japanese and Irish flags; two small flags are placed on a white table in the foreground.
Corporate and Commercial
Insight

Fieldfisher Advises Simply Blue Group on Strategic Investment by Kansai Electric Power Company

06.11.2025
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Four men in business attire stand together on a balcony outdoors, with a modern glass building and cloudy sky in the background. They are smiling and facing the camera.
Corporate and Commercial
Press Release

Fieldfisher and Regan Wall merge to build leading Irish corporate law team

05.11.2025
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A futuristic image showing a person using a tablet. Surrounding the tablet and their hand are glowing, intricate digital lines and nodes forming a virtual network or globe, suggesting connectivity and advanced technology. A document with charts is on the table.
Corporate and Commercial
Press Release

Fieldfisher advises serial entrepreneurs on strategic acquisition of HCS by Centric 360

27.11.2024
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Corporate and Commercial
Press Release

Fieldfisher appoints Peter O'Neill to enhance commercial, corporate and renewable energy law capabilities

08.10.2024
The appointment of the seasoned corporate, commercial and renewable energy law expert will complement Fieldfisher’s renowned international practice
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What others say…

Chambers Europe 2024

"Feilim O'Caoimh is reliable and provides robust advice."

Chambers Europe 2023
He knows his stuff when it comes to the commercial aspects, what's the market norm and what we need.
Chambers Europe 2022
Feilim O’Caoimh handles corporate and asset transactions as well as joint ventures, with a particular focus on wind energy projects. Clients say: "He is very commercial and brings a huge amount of experience, so he is not just theoretical - he solves problems and is a good negotiator."