3,500+ users in over 75 countries download and use CEA for urban decarbonisation since 2023.
*CEA-4 is an urban building energy modelling (UBEM) tool developed by such
world-leading research institutions as ETH Zurich in Switzerland 🇨🇭 and
Future Cities Laboratory in Singapore 🇸🇬.
CEA-4 Pro is uuen Company's
cloud edition of CEA-4 — with priority cloud computing and an expanded
professional feature set.
Our solutions
Whether you're an urban designer, educator, researcher, or public planner - we have a tailored solution to support your urban decarbonisation journey.
Today With CEA-4 Academia & practice
“We look forward to seeing and applying the upgraded CEA in the upcoming term in the teaching modules of our programme.”
“We applied CEA in a recent urban decarbonisation design competition in China. Data collection was seamless, and results were available almost instantly - enabling rapid, quantitative comparison of design scenarios.”
“CEA has been a fantastic tool for research and teaching purposes - serving my team and class.”
News
CEA's impact remains strong in academia — and is gaining real traction with governments and design firms pioneering decarbonisation at the district scale.
CEA-4 Pro has been successfully applied to evaluate the economic KPIs and decarbonisation potential of district cooling systems by a professional at the Ministry of Public Works using their headquarter campus.
The findings establish a data-driven foundation for new municipal planning policies, serving as the blueprint for upcoming national capacity-building programmes for city planners. Works carried out includes formulation of local database, data calibration using measured data, CEA district cooling design and assessment.
A research on the carbon implications of urban densification was recognised with the Best Poster Award at CISBAT 2025. The study validates CEA's capacity to simulate the complex interplays between block typology (form), density, and Net-Zero targets. This methodology allows developers and city planners to prove the environmental feasibility of high-density projects during the earliest design stages.
Read peer-reviewed paper
CEA-4 has been selected for the Swiss Pavilion at Expo 2025 Osaka. We are proud to showcase the CEA platform as a Swiss innovation for urban energy systems engineering and decarbonised urban design. Currently empowering professionals across 75+ countries, CEA-4 remains at the forefront of the science-driven transition to carbon-neutral cities.
Visit exhibition details
Shanghai Climate Week, we collaborated with Swissnex in China to hosted the third (2025) CEA User Meeting in Shanghai and released CEA-4. A formal MoU between the CEA Team at ETH Zurich and ECADI promotes CEA through Shanghai-based case studies, integrating the platform directly into their professional design products and high-density workflows.
CEA-4 Pro
From simulation to solution: CEA-4 Pro transforms complex energy and climate simulations into actionable design insights, helping you future-proof urban developments with confidence.
No need for high-spec machines - simulations run in the cloud.
Understand urban energy dynamics in a way that's intuitive and persuasive.
Upload your data, select your scenario, and let CEA-4 Pro do the rest. Saves days of manual setup.
Tailor feature sets, integrate into your design flow, or work with our team on project-specific needs.
Clean, legible design outputs and insights ready for stakeholders and clients.
For BIPV, where should PV panels be? For regeneration projects, which buildings to retrofit (first) or demolish?
Which buildings should be connected to a district thermal network, when minimising costs, emissions, and heat causing urban heat island effects?
Used in ETH, Tongji, NUS — plug and play in urban design studios.
Forecast building energy demand and emissions under projected climate conditions.
Pricing
Whether you are winning a global design competition or planning a carbon-neutral district, we ensure your vision is technically sound.
High-performance energy modeling for design and engineering teams.
CHF 1,800 CHF 950 / month
Let's talkYou have a deadline and need a model that won't fail.
CHF 9,500 CHF 4,500 / project
Let's talkYou need a long-term digital twin to test and validate large-scale policy.
Get a quote
Let's talkTransform your entire office into a carbon-neutral design powerhouse.
CHF 9,500 From CHF 7,500
Let's talkNeed something different? Just get in touch.
For students
We have secured some grants to support you using CEA-4 Pro with cloud computing for academic purposes.
Full CEA-4 Pro power for theses, PhD research, and coursework.
Discount Available
Let's talk*Verification of student status required.
Plug-and-play energy modeling for urban design studios and seminars.
From CHF 1,200 / Course
Let's talkNeed something different? Just get in touch.
FAQ
Explore our frequently asked questions to learn more about uuen Company, CEA-4, our services and the pricing.
uuen was founded to advance decarbonisation from the earliest stages of urban planning and design. We provide cloud-based urban building energy modelling (UBEM) services that empower stakeholders across the built environment to shape low-carbon cities.
Our team created the uuen services around the open-source City Energy Analyst (CEA). Each of us comes directly from the CEA Team and continues to hold dual roles in both teams. Through uuen, we're building a sustainable business model that supports CEA's ongoing development and expands its real-world impact.
More than just a technology provider, uuen exists to bridge a decade of research and teaching on energy-driven urban design, architecture, and building systems into practical tools and services for decarbonising cities.
City Energy Analyst (CEA) is an open-source urban building energy modelling (UBEM) tool developed and hosted at ETH Zurich's A/S Research Group and the Future Cities Laboratory since 2013. It remains freely available as a desktop-based tool for researchers, students, and practitioners.
uuen was founded by members of the original CEA team to bring CEA's capabilities into the cloud and support its use in real-world projects. While CEA remains open-source, uuen maintains and extends its features through CEA Pro, a cloud-enabled version that eliminates installation issues, offers faster and more stable simulations, and introduces enhanced tools such as advanced visualisation, auto-reporting, and design insights.
uuen also supports the community through training, plug-in development, and tailored services, ensuring that CEA can be used effectively by students, researchers, urban designers, and government agencies worldwide.
