'This is possible. We did it': the week Portugal ran on renewables

Campaigners say the 107 hours when the country was powered by wind, sun and water show they can replace fossil fuels

If you can keep your gaze off the hilltops, imagine away the pylons and forget the occasional tractor of an uncertain vintage coughing along the narrow roads, little appears to have changed in the valleys of north-eastern Portugal for decades, perhaps even centuries.

The gnarled alvarinho vines have been relieved of their fruit to make vinho verde, an old woman in black herds her sheep through a hamlet and hungry eagles hover over the fields, scanning the land for lunch.