A point that is discussed by the government of Baden-Württemberg is whether or not
it should be mandatory to use photovoltaic systems in all new buildings.
Especially the "Die Grüne", "Klimaliste" and "Die Linke" parties support and promote this idea.
A critical point is that introducing a law that forces all architects to use
photovoltaics would violate the free market rules. The state would interfere in
the market because everyone would have to buy photovoltaics. That would be
unfair for companies who do not produce photovoltaics but compete in the
same margin as companies who do sell photovoltaics.
Liberals claim that it is against the right of liberty to tell people
what they have to adjust in their houses.
The supporters of an obligation for photovoltaic systems argue that it is necessary
to involve CO2-neutral energies into our ever day life. If photovoltaic systems become mandatory, the big factory buildings would produce "green" energy on the side. In debates with critics they also remark that we already have laws about the
design of buildings in Germany. You are not allowed to paint your building, for example, in neon colours. The parties which support the photovoltaic systems in their campaign material often compare this new law to old ones. An example is that you have to dispose of your trash. You can not throw it into nature, but you have to use the disposal service or keep the trash. That is also an environmental law. A member of the "Klimaliste" also reasons that the photovoltaic systems are not big enough to be seen and that it barely is a intervention into private home designs.
In my opinion, the Obligation for photovoltaic systems is a great development in German politics.
It forces big companies to take to the their CO2 emissions into account and
become more "green". I do not think that it violates my right to liberty.