Even if the wholesale price of electricity fell to zero to reflect the short-run marginal cost of producing renewable electricity, the price paid by consumers would simply be more disconnected from the wholesale price than it is today. Consumers pay the wholesale price, plus a network cost (including congestion costs), plus a balancing cost, plus a subsidy cost, plus the retailer/supplier operating costs, plus some profits for everyone in the chain from the generator to the network owner to the network operator to the retailer. And then some taxes on top.
And to hit net zero the whole electrical system – expanded renewables, expanded grid, backup fossil, balancing, subsidies, curtailment payments and all – will have to be expanded to multiple times its current size, as fossil fuels used directly in such things as heating and transport are replaced with electricity.

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