Um S Marginal (1983)

In the near future, along the Portuguese coast, a network of ocean and solar power transformers will be installed. With the ecological balance seriously threatened, domestic animals disappear from the cities and return to wildlife in upland areas. On hearing of his sister's death in a road disaster, Jorge tries to warn his father - who, meanwhile, leaves for a secretly kept house, as a refuge and resting place.

Unfortunately the movie Um S Marginal is not yet available on HBO Max.