If the question is who is going to illuminate part of the new A-5 tunnel, the answer is simple: the sun

He burial of the A5 continues its course. It is one of the most ambitious works in the recent history of the Spanish capital and, after months of headaches, you can see the light at the end of the tunnel. There is still a way to go, but the light thing is quite literal if we take into account that, in the surface park, there will be enormous pergolas that will not only serve to provide shade.

They will be the battery of the tunnel.

The pergolas. From the beginning The project took into account the installation of an infrastructure that would allow the use of sunlight to power the tunnel through which the vehicles will circulate. The idea with this burial is to create a large green area of ​​80,000 m2 that, in addition to trees, will have another solution to shelter pedestrians: eight pergolas to combat the sun and rain.

They won’t be the only thing they will do. As the Urban Planning, Environment and Mobility area of ​​the Madrid City Council has commented to ABCall of them will have photovoltaic panels that will total 1,055 panels for a nominal power of 437 kW and an annual production of 561 MWh. It is the equivalent of the annual consumption of 200 homes in Spain and the energy that will power the installations of the underground section. We will see when the works are completed, since the Madrid City Council already calculation a production of 1,158 MWh per year.

Geothermal. All the pergolas will not be the same and the panels will be installed in the most optimal way possible to meet this estimated production, but it is not the only system planned to supply the park facilities with electricity from renewable sources. An example is the Ángel González Municipal Public Library, located at one end of the project.

Currently, and as detailed the town hall, the thermal installation compose of a 285 kW boiler and a 220 kW chiller. In their place, two 150 kW heat pumps will be installed and will employ low temperature geothermal energy to create a water circuit tempered at a constant 25 degrees. It is a form of renewable energy that takes advantage of the constant heat of the shallow subsoil to air condition buildings and produce hot water.

Undertaking work to switch to low-temperature geothermal is a complex and expensive process, but on the scale of the A5 underground, it makes a lot of sense. In this way, a pump will exchange heat with the ground to extract ground temperature in winter and, in summer, transfer heat from the building to the subsoil and, thus, cool the library. All this without local combustion.

Mountains in the capital. And since we’re talking about renewables and reusing, it’s curious what they will do with some of the land they are excavating. Instead of having to manage it as waste, in part of the walk will be created three artificial hills. It is a good way to take advantage of surplus land, but it will also have a useful function.

They will house thousands of trees that must be relocated due to current works, but, in addition, each of the hills will have a purpose. One will be a park with picnic areas and biodiversity areas, another will house a skatepark and another will become a viewpoint.

Let them finish now…That is the feeling of the neighbors who have been enduring headaches from noisebut also an urban ‘Mario Kart’. Because it is very good to undertake works that use renewable energy to solve specific problems, but it is normal that there are those who are choking on these works.

In the end, it is not easy to cut one of the access arteries to the city for almost two years to bury 3.2 kilometers of a highway on which 80,000 vehicles circulate a day. There is less left until the end of 2026…

Images | MadridMadrid City Council

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