A company has approached us offering to install free solar panels on our roof (if it turns out to be suitable). We get to use the electricity it generates during sunlight hours and any excess is sold back to the national grid. The company get the money from this.
One catch is that you have to agree to a 25 year lease on your roof, but we have just moved into what will be our home for a long time.
I can't see us having the spare cash in the future to buy our own panels - I think they're about 10-15K.
Is there a major catch I haven't seen?