All new buildings with large roofs must have solar panels installed. The law will apply to all new builds with a roof space of more than 300 m2.
But parliament has rejected a campaign to also include renovations and is still discussing solar panels for parking spaces.
The move comes after voters in canton Valais rejected building solar farms in the Alps.
Commentators suggested the people wanted buildings to be prioritized for solar panels before installing them in the mountains.
Thousands of Swiss nationals stuck in middle east
Anti-war demonstrators in Geneva
Parmelin signs EU deal
Parliament moves closer to end murder loophole
Water worker buried alive
Petition for quiet cars on trains
