alt Hacker NewsThis is the right move. The marginal price is the price that balances supply and demand by definition, and this must be the case on the grid at all times, even to the last milliwatt, or you immediately get a Spain situation with cascading blackouts where huge parts of the grid go dark.
That happened once, and the causes are still unclear/ being investigated. We don't have blackouts unless extreme weather or bad grid sectors (e.g. semi abandoned rural). Also, we have marginal pricing, and we had this pricing for years before the Blackout.
And you can have other pricing schemes, for example pay-as-bid, that also balance supply and demand.