Julien Walzberg

Julien Walzberg

Researcher III-Operations Research Analysis


Julien Walzberg is a researcher within NREL’s Strategic Energy Analysis Center where he works on various circular economy and sustainability projects.

Research Interests

Agent-based modeling

Life cycle assessment

Sustainability analysis and circular economy


Ph.D., Chemical Engineering, Polytechnique Montréal

M.S., Materials Engineering, Université de Technologie de Troyes

Professional Experience

Life Cycle Assessment Consultant, CT Consultant (2018–2019)

Project Engineer, Compagnie de Chauffage Intercommunale de l’Agglomération Grenobloise (2013–2014)

Featured Work

Mapping the Opportunity Space to Model the Circular Economy Using Tools Funded by the DOE Office of Energy Efficiency and Renewable Energy, NREL Technical Report (2022)

An Investigation of Hard-Disk Drive Circularity Accounting for Socio-Technical Dynamics and Data Uncertainty, Resources, Conservation and Recycling (2022)

Exploring Secondary Markets to Improve Circularity: A Comparative Case Study of Photovoltaics and Hard-Disk Drives, IOP Conference Series: Materials Science and Engineering (2021)

Role of the Social Factors in Success of Solar Photovoltaic Reuse and Recycle Programmes, Nature Energy (2021)

Do We Need a New Sustainability Assessment Method for the Circular Economy? A Critical Literature Review, Frontiers in Sustainability (2020)

Awards and Honors

Director’s Awards, NREL (2021)