Solar energy
Between the cities of Daejeon and Sejong in South Korea, there is a structure that looks like it came straight out of a futuristic urban planning book: a highway with cars on the sides, a dedicated bike path in the center, and a continuous covering of solar panels along 32 kilometers. The structure was installed over the last decade as part of the urban development of Sejong, a city planned to be the new administrative center of South Korea, housing ministries and federal agencies since 2013.
What many call an “urban solar tunnel” combines three layers that are rarely seen together: motorized transport, active mobility, and photovoltaic energy generation. In practice, asphalt and bike paths cease to be merely transit infrastructure and take on a productive function, generating electricity during the day while protecting cyclists from the sun and rain.
The corridor runs along the Daejeon → Sejong axis, in an almost straight line that crosses urban areas and planned expansion zones. The cycle path runs in the central reservation, physically isolated from cars by side barriers, while solar panel canopy runs along the entire route, creating shade and transforming the highway’s airspace into distributed generation.
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Sejong, being a recently built and technologically focused city, was the ideal environment for the implementation of this type of solution. The presence of ministries, universities, and technology centers stimulated the development of a… infrastructure geared towards clean energy and alternative mobility, with continuous cycle path networks, wide avenues and less dependence on cars for intra-urban journeys.
An important factor in this project is the concept of distributed generation: the electricity produced by the solar panels can be used to power public systems, urban lighting, mobility infrastructure, and even be reinjected into the grid as needed. South Korea imports a large portion of its energy, has little available land for large onshore solar power plants, and faces strong pressure to reduce emissions.
Transforming road lanes and traffic areas into solar infrastructure solves three problems at once: lack of space, transmission losses, and urban integration. Although the exact generation varies depending on equipment upgrades, South Korean studies and reports classify the stretch as part of a national strategy for… increase renewable share e reduce pressure on the fuel matrix based on imported fuels.
The covered central bike path is not a secondary detail—it’s the secret of the project. By placing cyclists in the center and cars on the sides, Korea breaks a global pattern where bicycles are often tolerated, not prioritized. Covering the bike path with photovoltaic panels reduces sun exposure during the summer, decreases the incidence of rain and wind, and creates a safer, more predictable, and comfortable environment.
In a country with dense cities, variable weather, and frequent commutes for study and work, this transforms the leisure bicycle into… real urban means of transport, especially for civil servants who commute daily to Sejong.
The choice is consistent with a larger set of investments that include dedicated lanes, bicycle parking, integration with public transport, and connection to administrative centers.
This solution didn’t emerge from a viral video, but from a structured public policy. South Korea has been building a strategy since the late 2000s. smart cities (smart cities) green growth (green growth) and electric mobilityWithin this strategy, Sejong was planned as model administrative city, bringing together ministries that were previously located in Seoul.
When Sejong began receiving state-owned structures between 2012 and 2014, the government needed to address logistics, transportation, and energy issues simultaneously. The response was to create an urban ecosystem where Mobility and energy coexist in the same infrastructure., something almost nonexistent in Western cities. The combination of:
It created the ideal environment for the emergence of the solar corridor.
The corridor stands out not only for its sun protection. It also reduces pressure on public transport and private vehicles. Protected cycle paths tend to:
The shade provided by the panels also reduces some of the radiation on the pavement, potentially lowering the local temperature and slowing down asphalt wear, although in-depth studies are still underway.
The South Korean model is rare because it requires factors that almost never coexist: a young city, centralized planning, high density, little open space, and external energy pressure. In countries where cities are old, fragmented, full of heritage restrictions and automotive lobbying, the adoption of this model encounters strong resistance.
Even European countries with a well-established cycling culture, such as the Netherlands and Denmark, still don’t combine cycle paths with solar power generation along dozens of kilometers. There are experimental projects, such as small-scale solar cycle paths, but nothing comparable to the Daejeon–Sejong corridor in terms of length and integration.
Looking at this project, it’s possible to see a new urban paradigm: infrastructure that serves not only for circulation, but also for production, shelter, protection, and supply. The South Korean corridor is a functional prototype of a city where mobility and energy are two sides of the same coin.
The logic is simple: if billions of square meters of streets, parking lots, and highways are exposed to the sun every day, why not transform them into… energy harvestingIf bicycles can circulate safely without competing for space with cars, why not put them there? dedicated corridors At the center of the system instead of at the edges? That’s the provocation Sejong throws at the world.
The South Korean solar corridor between Daejeon and Sejong is not just a beautiful piece of infrastructure in aerial images — it is a real urban laboratory, demonstrating that clean energy and active mobility can coexist in the same physical space without sacrificing efficiency or scale.
Instead of talking about the future, he shows the future already happening: 32 kilometers of solar panels, One planned administrative city, One Protected central cycle path and a A country that needs to generate energy where consumption occurs..
While the world debates theoretical alternatives to climate and urban crises, Sejong puts one of them on the street — literally.
Débora Araújo is a writer at Click Petróleo e Gás, with over two years of experience in content production and over a thousand published articles on technology, the job market, geopolitics, industry, construction, curiosities, and other topics. Her focus is to produce accessible, well-researched content of public interest. Suggestions, corrections, or messages can be sent to contato.deboraaraujo.news@gmail.com
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