Right, so they should have a competitive advantage over those "traditional" fossil-fuel burning electricity suppliers. That is, they can continue selling renewable electricity unaffected by gas prices.
Well, yeah, because electricity is fungible. Other power providers that can't get the electricity they need from gas are turning to renewables, driving up prices for everyone.
That's not what's happening. Coal-fired power stations are being re-activated to cover the shortfall.
You do raise a good point - as electricity is fungible, and the power grid is built, operated, and maintained by a national institution, then how can a particular energy provider promise that their power is more renewable than that from the the others? Otherwise, every time Bulb gets a new customer, we are supposed to believe that they get all the renewable electrons, and the power supplied to the rest of us is just a bit more fossil-fueled.
I do know the answer, and that is that those companies just buy and sell the various "pinky promise" certificates and accreditations that pass for being "renewable" and "carbon-neutral" , and have nothing at all to do with actually boosting the supply of renewables.
Edit: at least in the UK, they only claim green, not fully renewable.