
Accolades
Testimonials
Collated independently by Legal 500 research team.
‘Guyer's team is extremely capable, made up of excellent people and professionals. The human quality and depth of knowledge stand out.’
‘The firm's lawyers have specialisation in the matter. Likewise, they have participated in highly relevant projects which have given them recognition in the market. Guyer & Regules has a multidisciplinary team that allows comprehensive advice to clients on projects and energy. Among the lawyers worth highlighting, I mention Federico Piano.’
‘Extensive knowledge, in addition to legal expertise, extensive knowledge of the context, and the development of energy policy, in addition to participation in academic developments in the sector.’
‘Their best qualities are their humane treatment, their ability to understand the needs of their clients and follow the times of the companies they advise. Furthermore, the human quality of its professionals makes them the best. I especially want to highlight Federico Piano and Juan Manuel Mercant.’
‘Guyer & Regules is a reliable, updated and modern firm, which remains at the forefront both in legal matters and in applied technology, which differentiates it and makes it different from any other firm. Add to this the human quality of treatment and attention.’
‘Federico Susena has an impressive intellectual capacity and dedication to clients, updated and in constant contact and monitoring of the client.'
Key clients
- Ventus
- Acciona
- Abertis Total
- Shell
- Engie
- Tesla Energy
- NEXZUR
- Hudson Clean Energy Partners
- Aldesa Construcciones
- Consorcio PPP Circuito Vial I (Traxpalco and Hernandez & Gonzalez)
- Gasoducto Cruz del Sur
- Consorcio PPP Centros Educativos 2 (Saceem / Stiler / Berkes)
Work highlights
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.

Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Federico Piano
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Tania Cavallo
Javier Napoleone
Practice head
Juan Manuel Mercant; Federico Susena