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Otsuki Lab
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The lab uses mathematical models to map out the future of energy and electric power.
AboutAbout the lab
Drawing 2050's energy in numbers.
The Otsuki Lab (Environmental and Energy Systems Engineering Lab) studies the planning and assessment of energy and power systems for a sustainable society.
The lab builds models using mathematical programming and geographic information, and calculates future energy mixes and the costs of decarbonization technologies.
It is an interdisciplinary field bridging the sciences and the humanities, closely tied not only to engineering and science but also to economics and the social sciences.
The lab also conducts joint research with energy companies and external research institutes, and accepts students in the master's and doctoral programs.
Key terms
- Energy mix
- The combination of power sources and fuels, that is, how much electricity and heat is produced from which resources
- Mathematical programming
- A method of writing conditions as equations and calculating the combination that minimizes cost
- Power system
- The entire network of transmission lines and substations that delivers electricity from power plants to homes and factories
- Carbon neutrality
- Balancing carbon dioxide emissions with absorption to reach net zero
NewsLab news
A master's student received the Poster Presentation Award at the 35th Annual Meeting of the Japan Institute of Energy
Associate Professor Otsuki and a graduate of the lab received the 22nd Paper Award of the Japan Society of Energy and Resources
A paper comparing transport costs of green hydrogen carriers was published in Transformative Energy
A paper from joint research in which Associate Professor Otsuki participated was published in Energy for Sustainable Development
Associate Professor Otsuki took up the post, and the lab was established in the Graduate School of Environment and Energy
ResearchResearch themes
The lab conducts research from the perspectives of energy systems, renewable energy, hydrogen, critical minerals, and energy security. It aims to produce results that are useful for government and corporate decision-making, in addition to academic outcomes.
*Illustrative imageDecarbonizing the Global Energy System
"Global models" used to examine worldwide decarbonization scenarios have had coarse regional and temporal resolution, making it difficult to handle the regional imbalances and time-by-time variability of renewable energy. The lab develops finer-resolution models and studies optimal renewable energy deployment scenarios and the costs of decarbonization.
*Illustrative imageJapan's Energy Mix
Drawing up a national energy plan requires tools that reflect the characteristics of domestic demand and resources. The lab develops a model that incorporates the structure of Japan's energy supply and demand and more than 500 decarbonization technologies.
*Illustrative imageEnergy, Minerals, and the Circular Economy
Renewable energy and storage batteries use critical minerals such as lithium, cobalt, nickel, and rare earths. The lab develops new tools that can handle energy and minerals at the same time, and also evaluates the effects of a circular economy for minerals.
*Illustrative imagePower System Planning and Operation
The lab is working on how to introduce solar and wind power on a large scale. It studies questions such as how much electricity storage capacity is optimal and whether an international power grid can be built in Northeast Asia.
MembersFaculty
The members of the Otsuki Lab consist of faculty, technical assistants, and doctoral and master's students.As of 2026
- Associate ProfessorTakashi Otsuki
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Earth's City Lights by DMSP, (large)” Data: Marc Imhoff/NASA GSFC, Christopher Elvidge/NOAA NGDC; Image: Craig Mayhew and Robert Simmon/NASA GSFC / Public domain (cropped)
- Decarbonizing the Global Energy System: “Red Trail Energy ethanol CO2 capture plant Richardton ND1” Acroterion / CC BY-SA 4.0 (cropped)
- Japan's Energy Mix: “Wind Turbines and Power Lines, East Sussex, England - April 2009” Diliff / CC BY-SA 3.0 (cropped)
- Energy, Minerals, and the Circular Economy: “Sunrise Dam Gold Mine open pit 11” Calistemon / CC BY-SA 4.0 (cropped)
- Power System Planning and Operation: “Switchyard of electric substation 750kV” Novoklimov / CC BY 4.0 (cropped)
- Related lab (紙屋研究室): “Electrically-powered city bus, Piotrków Trybunalski, Poland” WrS.tm.pl / Public domain (cropped)
- Related lab (小野田研究室): “Suburban rooftop solar power generation in Canberra, Australia” Benlisquare / CC BY-SA 4.0 (cropped)
- Related lab (野津研究室): “Rice terraces in Hatenashi village A” さか
おり / CC BY-SA 4.0 (cropped) - Related lab (馬場研究室): “Up and down” Roberto Picco from Sacile (PN), Italy / CC BY 2.0 (cropped)
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