The phrase “no such thing as a free lunch” springs to mind here.

From day one of these rent-a-roof and free solar panels offers springing up, we were warning people and encouraging people to own outright for exactly this reason.

Third party ownership comes with many pitfalls and the resale-ability of a home with third party technology attached is the biggest. Many people who took up these offers are still blissfully unaware of the consequences and because the feed-in tariff can last up to 25 years, that’s along time to be shackled to such a contract.

Also people do buy and sell these feed-in tariff contracts from homeowners, but this will be very much to their financial advantage and not yours, but ultimately won’t solve the third party ownership problem unless you purchase the contract yourself.

https://www.powermyhome.uk/pv-solar-export-tariffs/

It’s a minefield that most mortgage lenders do not want to get involved with.