Stefan Pfenninger-Lee is an Associate Professor at TU Delft with 15 years of experience leading research teams that quantify technical, economic, and policy trade-offs for 100% renewable energy systems. He combines domain expertise in spatiotemporal variability of renewable generation with hands-on software development, leading the scientific Python and full-stack implementations behind callio.pe and renewables.ninja. His work bridges academic rigor and production-grade tooling that policymakers and system planners actively use, reflecting rare fluency across modeling, data engineering, and web platforms. Based in Delft, he mentors researchers while maintaining an active developer role, ensuring research outputs are reproducible and accessible. Notably, his projects translate complex climate and energy datasets into user-friendly services, accelerating real-world adoption of research insights.
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