Able to ‘balance clients’ interests with closing deals within the required timeframes’, Prieto Abogados’ large projects and infrastructure team has longstanding experience in the development, implementation, acquisition, and financing of projects across a range of sectors, including energy, mining and ports. The practice is sought out to advise at every stage of projects’ life cycles, from tender processes to construction phases, as well as to assist with operation and maintenance agreements (O&M), claims, and potential litigation. Its track record further includes being mandated by domestic and foreign companies for overseas projects, such as in Ecuador and Colombia. Co-leading the group, Juan Tagle routinely advises on power plants (particularly renewables), transmission lines, ports, mining and desalinisation construction projects, including joint ventures and bidding processes; while Nicolás Yuraszeck K has significant experience in build-own-operate-transfer (BOOT) and construction projects, along with tenders, project finance, regulatory issues and M&A transactions. In January 2026, Isabel Monge, an adviser to lenders and borrowers on mining, electricity transmission and renewable energy project-related financings; and counsel Emilio Del Real, who is experienced in large-scale projects, were promoted to partner and counsel, respectively. At senior associate level, Josefa Reyes’ track record covers the energy, mining and desalination industries; and Emilia Valenzuela assists with preparing tenders and negotiating construction contracts.
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Testimonials
Collated independently by Legal 500 research team.
- Josefa Reyes' analytical skills allow her to manage complex contractual responses by simultaneously cross-referencing information across different cases. She has a strong focus on risk analysis and identifying contractual claims.
- The team is characterized by its experience in infrastructure contracts and financing structuring, coupled with active participation in defining the scope and type of project. This combination of technical expertise and practical commitment allows them to provide tailored solutions and become strategic partners for the client.
- Prieto's greatest strength lies in collaboration, handling complex issues, and quickly delivering opinions, solutions, or feedback on assigned tasks. They are commercially astute and know how to balance clients’ interests with closing deals within the required timeframes.
- Nicolás Yuraszeck K and Emilia Valenzuela are true experts in construction contracts, EPCs, O&M, and all aspects of project management. They possess extensive experience in negotiating the essential elements of a contract, effectively protecting the client's interests while successfully navigating negotiations. Nicolas' availability as a partner throughout the process is crucial, and both he and Emilia are always available to answer questions or meet with the client/counterparty.
Key clients
- Conexión Kimal Lo Aguirre
- Scala Chile Data Centers
- Compañía Minera Doña Inés de Collahuasi SCM
- Engie Energía Chile
- Transmisora Eléctrica del Norte
- Corporación Nacional del Cobre
- International Waters Services – Veolia
- Anglo American
- EDP Renewables
- BNP Paribas
- Export Finance Australia
- ING Capital
Work highlights
Advising Conexión Kimal–Lo Aguirre on the construction and entry into operation of a high voltage direct current (HDVC) power transmission line of approximately 1,500km.
Advised Anglo American on the development of the Pérez Caldera Tailings Removal Project, involving the removal and transportation of tailings from the Pérez Caldera tailings storage dam to Las Tórtolas, through infrastructure to be refurbished and constructed by Stracon Pérez Caldera .
Advised Scala Data Centers on the $328m project financing for the construction and development of three large-scale data centres and an electrical substation in Chile.
Lawyers
Hall of Fame
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Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
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
Juan Tagle: Nicolás Yuraszeck K
Other key lawyers
José María Lagos