Source here with detailed information for each state in case you are interested in getting a balcony or window mounted solar system
Plug-in solar lets anyone generate free electricity — no roof, no permit, no contractor. A single panel on your balcony can meaningfully cut your bill, especially as rates keep rising.
Found it in this discussion: !https://slrpnk.net/post/39512229/22991609
Is it already legal in your country/state?
There is a risk if the wiring of your place is bad, or the wiring outside your place is bad, or if there is no protection against over current/voltage for your neighbours, or …
There is a lot of hurdles to be overcome, but in general we have tackled them all already.
For example, here it is only legal to produce 800W with plugin installations and the transformers need to be certified on sale ( not installation ).
That certification regulates what it should do if there is no power on mains ( = produce nothing ), that it should use mains to be in sync with mains power, that it should not produce more than 800W, and should not push in more power when voltage on mains is more than 6V over spec ( aka, 246V is ok but is the limit. Above that can causr damage ).
Weve had solar for years now and a lot of the hurdles have been fixed. ( remember when at the start you could cause damage at your neighbours home because your panels raised the voltage too high? Good times )
Either case, even if i pay some money to put power back on the grid, every watt i generate is a watt i didnt pay in usage. Days like these my apartment fully lives of the 400W my plugin set generates during the afternoon