Musk is a cunt and Tesla are shit

I don't know. I have no knowledge about the topic, I'm genuinely asking how a "supplier" who supplies a product from a big mixed pot can claim that all of their customers get exclusively the good energy.

When if without Bulb, the renewable energy was still being produced, and everyone would be in exactly the same position.

Dunno on this point, guess it depends on what happens with excess supply, not something I know anything about either.

Fair enough if they said our customers use this much and through our power producing sites, we produce enough to cover that volume. But they don't do they?

Well this is the tricky bit isn't it? Does the fact that there are suppliers like Bulb fronting the consumer side of it, lead to increased production of renewables? I can't see it being a bad thing either way.

You aren't really getting green but the supplier will buy the REGO's which are certificates that the energy was renewably generated and if the supplier retires the REGO's it means it can only get sold once as green electricity. All sorts of wonky shit goes on with green energy and double counting but it can be done effectively. The fudge is, say their customers use 1GWh a year of energy, they can buy 1GWh of REGO's but it could for arguments sake be all from solar farms, so was only produced in day light hours but they are saying it is the equivalent to what there customers used over the whole day.

The infrastructure just isn't there to support 24/7 renewables yet and won't be for a long time. Gas will be doing the heavy lifting for times of peak demand and low renewable output for a long time yet even if your energy tariff claims otherwise. We could get there a lot sooner with nuclear but seeing that hitachi and toshibi have both pulled out of new build nuclear in the UK recently, we are pretty screwed on that front.