Portrait of Guillaume Castroviejo

Guillaume Castroviejo Consultant

Guillaume is a member of Oxera’s Regulation and Market Design team. He specialises in the economic regulation of infrastructure and utilities.

He joined Oxera in 2021, after completing a Master’s degree in Economics of Markets & Organizations at Toulouse School of Economics, and a double Bachelor’s degree in Economics and Mathematics and Computer Science. During his studies, he specialised in microeconomics, game theory, regulation and competition economics, and spent a year at the University of Reading attending competition and regulation courses. He also spent a year teaching microeconomics to undergraduate students in Economics and Law at the University of Toulouse Capitole.

Guillaume provides advice to water and energy companies in the context of cost assessment modelling, and has undertaken several regulatory due diligence assessments. He writes regularly for Oxera’s Agenda publication.

Guillaume speaks English, and French.

Tel: +33 (0) 1 80 20 91 84

Guillaume's specialisms include:

Selected
professional experience

  • Advice on the acquisition of a stake in Northumbrian Water (2022)

  • Advice to SSE on the divestment of a stake in its electricity transmission business (2022)

  • Market power assessment and advice on regulatory issues to a French airport (2022)

  • Provided support to a sports betting company in its state aid procedure with the European Commission (2021–22)

  • Economic analysis of alleged coordinated behaviour between European beverage producers (2021–22)

  • Ongoing work advising several UK water companies in the context of cost-assessment modelling in preparation for Ofwat’s PR24 price review (2021–)

Qualifications

  • MSc Economics of Markets & Organizations, Toulouse School of Economics, France

  • BSc Economics, Toulouse School of Economics, France

  • BSc Mathematics and Computer Science, University Toulouse 1 Capitole, France


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Latest Insights:  Guillaume Castroviejo

Agenda
9 minute read
Depiction of RIIO-ED2 Final Determinations

RIIO-ED2 Final Determinations

On 30 November 2022, Ofgem published its Final Determinations (FDs) for the RIIO-ED2 price control covering the electricity distribution (ED) sector for the next five years from April 2023 to…
Agenda
8 minute read
Depiction of Like an economist at Wimbledon

Like an economist at Wimbledon

To what extent is future success affected by past success? This topical question has implications for many areas of society, including education. However, a new study suggests that the answer…
Agenda
16 minute read
Depiction of When to give the green light to green agreements

When to give the green light to green agreements

Should companies be allowed to cooperate—or ‘collude’—on socially beneficial environmental behaviour? Do companies even have the incentive to cooperate on socially beneficial behaviour? In this article, we reconcile apparently divergent…
Events

Seminar on the Foreign Subsidies Regulation

Join us on 2 February 2023 to hear from some of the foremost experts on the Foreign Subsidies Regulation (‘FSR’), including Ben Smulders, Deputy Director-General, State Aid, DG Competition; Christof Schoser, Head of Commission Task Force on the FSR; Ianis Girgenson, Group General Counsel, United Group; and Denis Redonnet, Deputy… Read More

Image depicting Seminar on the Foreign Subsidies Regulation

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