The Dutch energy supplier NextEnergy is offering its customers a free 2 kWh plug-in battery.

The (4-year) monthly lease is €20.83, with guaranteed yearly savings of €250.

https://www.nextenergy.nl/smart-home/plug-in-batterij-kopen

@burger_jaap Wow! That is a real profit! Paying at about 250 euro a year to save 250 euro a year.....

Well, at least then you don't lose money.

@AngelaScholder yes. Though they offer the 250 euro guarantee for five years, and (as I understand it) the lease is 4 years. So the net benefit should be 250 euro.

But buying a similar battery for 400 euro in Germany could yield 850 euro over the same 5 years.

@burger_jaap And these battery systems can be utilised as backup power sources, like being a sort of UPS. However, no idea how the converter works. So, might certainly not be 'uninterruptible'.

It's not forbidden, but systems that can deliver electricity mack to the net connecten as plug-in is not a good idea. It should be fixed connections.
In the early 2000s we had the Soladin inverter with solar panels as plug-in systems. So, it's not new.

@AngelaScholder Some can, and also advertise that functionality.

The Soladin early success in the Netherlands has actually informed the German regulatory debate to allow plug in solar. And now it’s spreading from Germany to all markets, including with plug-in batteries.