How well do you know them? That's what I'd go off before handing anyone a bill with a name and address on, they can be used for proof of address when applying for jobs, loans, what have you.. There are people who even search residential waste bins for things like that.
If your in a state with multiple sources you can probably shop suppliers on your own, that information is so vague I would not act on it, could be selling solar cells or efficient windows.
He should be paying more for those 15 references than some vague promise of savings.
(He's being a bit greedy asking for 15)
It sounds like one of the energy MLMs (aka.....pyramid schemes) that are available in some states.
Stay away.
It's just a version of pyramid selling. Keep out of it.
This is BS and you know it. How would taking pictures of your electric bill lower it?
He is not a real friend.
Would not happen in the UK.