Dr. Janet L. Reyna is a senior research engineer in the Building Technologies and Sciences Center at the National Renewable Energy Laboratory and a joint faculty in Civil and Environmental Engineering at Colorado School of Mines. Previous to joining NREL, she was an ORISE Science & Technology Policy Fellow at the DOE Building Technologies Office. Her research interests include assessing the energy and environmental impacts of urban areas at city and regional scales, as well as developing decarbonization strategies for the U.S. building sector. She is a developer on NREL’s ResStock building stock energy model.

A key goal of Dr. Reyna’s research is to provide quantitative information to support policy and decision-making. She has expertise in life cycle assessment, energy forecasting, building stock energy modeling, vehicle emissions simulation, and spatial analysis. 

Research Interests

Building stock energy modeling

Climate change, future weather, and energy use

Building stock dynamics

Building-electric grid interactions


Ph.D. Civil, Environmental, and Sustainable Engineering, Arizona State University

M.S.E. Civil, Environmental, and Sustainable Engineering, Arizona State University

B.S. Mechanical Engineering, Purdue University

Featured Work

U.S. Building Stock Characterization Study: A National Typology for Decarbonizing U.S. Buildings. NREL Technical Report (2021)

Developing a common approach for classifying building stock energy models, Renewable and Sustainable Energy Reviews (2020).

Assessing the potential to reduce US building CO2 emissions 80% by 2050, Joule (2019).

Energy efficiency to reduce residential electricity and natural gas use under climate change, Nature Communications (2017).

The Growth of Urban Building Stock: Unintended lock-in and embedded environmental effects, Journal of Industrial Ecology (2015).