2023 EU plug-in model and V2G (or V2H/V2X)

welcome!

there is nothing official from toyota, but it would likely void the warranty.
that being said, i have never seen it done here, and you would probably need a lot of knowledge to attempt it on your own.
there is a lot of information on the net like this:

vehicle-to-grid-v2g

but i can't find anything with specific instructions or parts availability.

all the best!

 

Short answer: No.

While it wouldn't be worth the effort, it would be relatively straightforward to turn the Prius PHEV into an emergency home power source. All the real work would be done on the home's electrical system. But if you're doing that work, honestly a fossil fuel backup generator would do the job better and far less clumsily(a backup generator can be installed to activate automatically in case of grid failure; the Prius would have to be manually plugged in and activated after the power loss, and there would be the problem of exhaust gasses).

But using the Prius PHEV as an integral part of the home's electrical system as a home battery is something altogether different. The car's electrical system is not set up for that at all. It could probably be done by someone with advanced knowledge of battery management systems that would basically need to build a separate control system and install a bypass on the factory modules. I certainly wouldn't even know where to begin. Again, for the amount of money and effort it would take, it would be far more efficient to just buy a home battery designed for the purpose. Modding the car to the extent needed would absolutely void the car's warranty, and probably also void a home insurance policy if something bad were to happen.

 

Japan had the means of V2H with plug ins, and even some FCEVs for power only. The PiP and gen4 PHV supported it. The issue for other markets is that the system worked through the CHAdeMO plug, and then the equipment cost more than a basic Level 2 charger. Which is a real problem in regards to the latest PHV, as it doesn't have CHAdeMO even in Japan. The standard is going through changes, so that might change.

Someone was working on a charger with automated emergency power switchover system with their PiP back then. Unless the project is a hobby, much easier, and likely cheaper, to just install a home battery.

 

i saw a video of a guy who had dedicated solar panels to charge his car, and used his riding mower as a buffer.
the whole setup was pretty complicated, and he wasn't even using it to power the home.

 

it seems to be coming quickly, but more likely on ev's than phev's due to battery size

 

Section 6 (Internal Accessories) of the manual, which you can download from the Toyota website, contain details about how to use the power socket in the trunk. It can provide up to 1500 W of sustained power at ~230 V, but it is written not to use it as a generator to power a home. It does leave open the possibility to connect it to an emergency power supply system though, for instance something with an external power source or something separate from the electrical wiring or the company providing electricity to the home, so occasional uses in such circumstances should not void the warranty.