1 In construction and agricultural zones, solar panels on roofs which are sufficiently unobtrusive do not require a building permit in accordance with Article 22 paragraph 1. The competent authorities must merely be notified of such installations.
2 Cantonal law may:
a.
determine specific, less aesthetically sensitive types of building zone in which other solar installations may also be erected without planning permission;
b.
require a building permit in clearly described types of protection zone.
3 Solar installations on cultural and natural monuments of cantonal or national importance always require a building permit. They may not be detrimental to the monuments to any significant degree.
4 In all other cases, in principle the interests of solar energy use on existing or new buildings outweigh aesthetic considerations.