
Herbert Smith Freehills Kramer LLP delivers comprehensive guidance on environmental regulation, permitting, waste and water matters, and disputes with regulatory bodies, while also advising on major energy transition projects such as green hydrogen, biogas and offshore wind. Practice head Iria Calviño specialises in decarbonisation, renewable energy, environmental permitting and contentious matters. Esther Lumbreras routinely advises on ESG-related environmental risks, and José Ramón Mourenza is highly regarded for his expertise in climate change regulation and environmental impact assessments.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
- ‘We've been collaborating with HSFK for a long time, and the firm is usually involved in all our processes. The firm's lawyers provide us with the knowledge and support we need, directly and flexibly.’
- ‘This is a multidisciplinary team that provides comprehensive solutions to the problems presented, taking a 360º view of the issue. We highly value the experience of the team members, who demonstrate absolute availability at all times.'
- ‘This is a team that is always available, responding quickly and efficiently, while maintaining a high level of technical expertise.’
- ‘Iria Calviño, José Ramón Mourenza, and Esther Lumbreras are brilliant and practical lawyers. They solve problems, which adds great value.’
- ‘The partner provides personalised and efficient customer service, enabling effective and smooth communication.’
- ‘José Ramón Mourenza is a highly professional individual with clear ideas and a decisive approach. His advice is always accurate.’
Key clients
- Berkeley Minera España
- Cobre las Cruces
- IB Vogt
- Igneo Infrastructure Partners
- Finerge Europe
- Orion Resource Partners
- Elecnor
- Legal Response International
- Ocean Born Foundation
Work highlights
Advising Berkeley Minera España on all the legal aspects related to its uranium mining projects in Spain, especially on regulatory, environmental and contentious litigation (drafting allegations, assisting in the challenges against the permits, environmental etc.) matters.
Advising Elecnor on the €1.8bn sale of its renewable energy subsidiary Enerfín to Norwegian energy company Statkraft.
Advised Igneo Infrastructure Partners on the acquisition of ENSO group, the main integrated bioenergy platform in Spain, specialised in the engineering, development, financing, construction, operation and supply of thermal power plants and biomass cogeneration, from Tikehau Capital.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Practice head
Iria Calviño
Other key lawyers
Esther Lumbreras; José Ramón Mourenza

