You well know that the finer details of substantial policy changes such as this will be legislated after the election. There will be time for submissions from affected parties and all this will have to go to the select committee stages before finally something workable is drawn up.
To expect all this finer detail to be drawn up before an election is unreasonable and it never happens.
What you do have in the public domain now is a 'theme' of lower power prices for voters, as a promise by Labour/Greens (The actual detail does not matter, from a political perspective). I was going to say lower power prices for everybody. But if you are an industrial or commercial consumer the power reforms have already delivered lower prices. It is only the poor old private consumer that has missed out.
With Labour/Greens in government, they will certainly have the power (sic) to push through whatever changes they need do to achieve their objective. Of course it will be difficult, and tweaking will be required. But to say that you can't see how it will be done so therefore it can't work is the head in the sand position from my perspective.
SNOOPY