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.
Geneva hosts two vital diplomatic meetings today
For at least 48 hours, Geneva becomes the world’s diplomatic epicentre, hosting two sets of high-stakes talks at the same time.
Snowfall grips Alps - high avalanche warnings almost everywhere
Heavy snowfall is tightening its grip across the Swiss Alps, triggering deadly avalanches and major disruption.
Snow derails train - injures 5
A train derailed near Goppenstein in canton Valais after an avalanche swept across the line yesterday morning.
Train travel remains disrupted in Lausanne
Train travel between Geneva and Lausanne remains problematic today.
High franc - high cost for business
Pressure is mounting on the Swiss national bank to intervene to slow the franc's relentless rise.
Economy grows a little
Switzerland’s economy edged up by 0.2 per cent in the fourth quarter, according to an initial estimate from the State Secretariat for Economic Affairs.
