Barcelona reinforces traffic lights with batteries to prevent blackout chaos

A thousand key junctions will have batteries so that traffic lights do not go out. The City Council seeks to prevent traffic collapse in future power cuts. The measure affects the city’s busiest points. This is how Barcelona is preparing for new emergencies.

A power cut can turn any everyday journey into a nightmare. In Barcelona, the last major power outage left thousands of drivers and pedestrians stranded at junctions without traffic lights, with traffic plunged into chaos. The city, accustomed to a frenetic pace, saw how the lack of light signals turned the main intersections into genuine conflict points.

To prevent this situation from recurring, the City Council has decided to install uninterruptible power supply systems at traffic lights at the busiest junctions. More than a thousand strategic points will have batteries capable of keeping the lights working even if the power grid fails. The objective is clear: to guarantee road safety and prevent collapse in the event of new blackouts.

The measure forms part of the new urban-signage maintenance contract. Priority is given to junctions with the greatest flow of vehicles and pedestrians, where a failure can have immediate consequences for mobility. In this way, Barcelona anticipates possible emergencies and strengthens its infrastructure to protect the daily life of those moving around the city.

Uninterruptible power supply systems already proved their effectiveness during the last blackout, when some junctions equipped with batteries continued to operate while the rest of the city was left in darkness. Now, the extension of this technology seeks to ensure that no key point is left unprotected in the face of future electrical incidents.

The initiative responds to the need to adapt the city to the challenges of an increasingly strained electricity grid. With this commitment, Barcelona takes a further step in modernising its urban mobility and preventing risk situations for all its inhabitants.

Traffic lights are part of Barcelona’s everyday landscape, but their operation is much more complex than it appears. Behind every red or green light is a centralised control system that regulates the flow of vehicles and pedestrians in real time. The addition of backup batteries represents a key technological advance in guaranteeing continuity of service, especially in a city where mobility is essential to daily life and economic activity.