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?
Currently to have solar in the US, you need a permit from your electric utility. The process of granting that permit means utility engineering looks over your proposed solar setup, and determines if it will be safe for the grid if switched on.
Plug-in solar laws look to remove that permit process, but the engineering check still needs to be there so people don’t plug in random shit and put others at risk of electrocution during outages. That’s where UL steps in and requires all plug-in solar products to adhere to minimum safety standards.
Plug-in solar shifts the engineering burden from utilities to safety laboratories like UL. This means prosumers have an easier path to generating their own electricity, and utilities don’t get bogged down with small prosumers that are only interconnecting single or double digit kWac arrays.