This is the heartwarming moment a resident offers water to drivers stuck in traffic during a power outage in Madrid.

Dramatic footage captured by Rafael Cauqui shows the kind-hearted local carrying a glass and a pitcher, offering water to motorists stranded on the road on April 28.

Rafael said: 'There is always light, even in the darkness. Yesterday, amidst the chaos, an anonymous citizen went car by car, offering water with a smile. No cameras, no noise, just to help. There are always those who choose to be a light. People like you change the world.'

The gesture brought comfort during a major blackout that caused widespread disruption in Spain on Monday afternoon.

Authorities said the power cut was due to a significant grid failure that affected large parts of Spain and Portugal.

Spain declared a state of emergency, deploying more than 30,000 police officers to manage the disruption caused by the power failure.

Tragically, at least four people reportedly died during the blackout.

An elderly couple and their son were allegedly found dead at their home in Ourense from carbon monoxide poisoning after using a generator during the blackout.

A woman also died Monday night after a fire, believed to have been caused by a candle, engulfed her apartment in Madrid.