Porto City Council stated that the power outages and the intermittent operation of various city traffic lights were caused by the "thunderstorm that affected the northern part of the country, and in particular the city of Porto".

The municipality said that of 46 traffic lights, 20 still remain with power outages and that the system is also unable to communicate with the remote management of 70 lighting installations.

Praça Mouzinho de Albuquerque, on Avenida Boavista, is one of the streets where the situation remains unresolved, with four traffic lights still only working intermittently.