
Pérez Bustamante & Ponce is engaged in both the public sector, with matters relating to mining regulation by the Government of Ecuador, and the private sector, with large oil and gas companies featuring as key clients. It has recently expanded its work in alternative energy projects such as sustainability projects through the hire of senior associate Santiago Miño. The group has a broad range of environmental regulation knowledge, the remit of Sebastián Cortez, who utilises this knowledge to assist oil and gas companies with operations and negotiations, including contractual matters. More broadly, the group handles regulatory, commercial and environmental matters related to hydrocarbons, electricity and mining as well as in the renewable sector. Francisco Roldán-Cobo, Sebastián Pérez-Arteta, Jaime Zaldumbide and María Isabel Aillón are all key team members, and at the associate level María Paula Grijalva-Galárraga stands out for advice on land use in power projects, often including electricity and non-conventional renewable energy. Estefania Lopez-Verdu has been promoted to the partnership, and the firm has significantly boosted its environmental law capabilities with the hire of specialist Rafael Pástor Vélez (plus three associates and four technical specialists) from his boutique law firm.
Legal 500 Editorial commentary
Key clients
- Entoria
- Adelca
- Pronaca
- Enerland
- Cobra
- Total Energies
- Neoen
- PCR
- Pluspetrol
- Codelco
Work highlights
Assisted Villonacoenergy with obtaining the declaration of public utility for some of the land required for the Villonaco III Wind Power Project.
Advised PetroOriental OCP holding on the regulatory, tax and antitrust requirements and the process to follow in Ecuador to be able to sign a share purchase agreement to sell its shares in OCP to Pampa Energía Bolivia.
Advised Petrolia on the negotiation and execution of two agreements with the Ministry of Energy and Mines for the execution of due amounts concerning the application of the stabilisation clause in Service Exploration and Production Contracts for Blocks 16 and 67.
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.

Jaime Zaldumbide
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Sebastián Pérez Arteta
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.
Practice head
Francisco Roldán Cobo; Sebastián Pérez Arteta; Jaime Zaldumbide; Sebastián Cortez; María Isabel Aillón


