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Alex Vlachokostas

Alex Vlachokostas

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352


Alex Vlachokostas is a Research Engineer in the Building & Connected Systems group. His research interests include Energy Modeling, Energy Efficiency, Connected Devices in Residential Buildings, and Transactive Energy. He received his Bachelor degree in Electrical and Computer Engineering from National Technical University of Athens (NTUA) in Greece. Then he pursed his MS in Sustainability in the Urban Environment at City College of the City University of New York and participated in the college's Solar Decathlon project. Followed by the MS, Alex continued his studies to pursue a PhD in Electrical Engineering.

During his PhD studies he interned with private engineering companies and National Labs which helped him advance his all-round-education on building energy systems. Alex is always interested in innovative low-cost/high-impact projects that can reduce energy consumption in both residential and commercial buildings.

Alex's Google Scholar

Research Interests

  • Energy modeling & simulation
  • Energy efficiency
  • Sensor prototype development
  • Transactive energy

Education and Credentials

  • Ph.D., Electrical Engineering, City College of City University of New York, 2016
  • M.S., Sustainability in the Urban Environment, City College of City University of New York , 2011
  • B.Eng., Electrical and Computer Engineering, National Technical University of Athens, 2009

PNNL Publications


  • Papadopoulos S., C.E. Kontokosta, E. Vlachokostas, and E. Azar. 2019. "Rethinking HVAC temperature setpoints in commercial buildings: The potential for zero-cost energy savings and comfort improvement in different climates, Building and Environment." Building and Environment 155. PNNL-SA-144814. doi:10.1016/j.buildenv.2019.03.062
  • Wang N., E. Vlachokostas, M.I. Borkum, H. Bergmann, and S. Zaleski. 2019. "Unique Building Identifier: A Natural Key for Building Data Matching and its Energy Applications." Energy and Buildings 184. PNNL-SA-132556. doi:10.1016/j.enbuild.2018.11.052


  • Goel S., J.C. Gonzalez Matamoros, E. Vlachokostas, and N. Wang. 2018. "Food Service Building Asset Rating Methodology and Analysis." In 2018 ASHRAE Annual Conference, June 23-27, 2018, Houston, TX, Paper No. HO-18-C045. Atlanta, Georgia:American Society of Heating, Refrigerating and Air-Conditioning Engineers. PNNL-SA-132795.

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