...as said before, I don't care about the points--I haven't even entered an answer--but I do use the glossary from time to time. Some
asker feedback would have been appreciated.
A couple of points:
First, in response to "technically remain on the grid and even feed any excess..."
Yes, that is called the FIT scheme in the UK and the FIT program in California:
https://www.ofgem.gov.uk/environmental-programmes/fithttp://www.cpuc.ca.gov/RPS_Feed-In_TariffBut this isn't the main issue here; the word "autark" should have pointed you to grid-independent supply. The example I linked to when agreeing with Ramey was the one Martina is most likely referring to:
http://www.okofen-e.com/de/stromautark/Right there, it says: "Zusätzlich lädt die Photovoltaikanlage ihre Stromproduktion, die nicht benötigt wird,
in den Stromspeicher."
The whole point of this building is that you don't need the grid. From my link below:
"...und damit theoretisch nicht mehr auf Stromleitungen angewiesen wäre..."
With a caveat, of course:
"Dass Häuser zwar am Stromnetz angeschlossen bleiben, sich aber zu einem Großteil selbst mit Energie versorgen, daran führe aber kein Weg vorbei..."