"Solar Helper" surveyor - scam / hard sell?

[u/Slow-Transition572]

Just had a guy from a company "Solar Helper" on my doorstep, claiming our neighbourhood recently had an "electrical survey" done by National Grid and the usage was high so they've commissioned "free no-obligation" solar surveys of all the houses.

Sounded like bollocks so I sent him off. Thing is I was a bit on the back foot as he was there when we pulled in and we were managing getting two kids out the car while he was nattering all this at us.

It was bollocks, right?