Typically ramping a coal plant up or down only takes a day or so, so if the prices stay negative for entire days, probably there's some kind of perverse incenti

Typically ramping a coal plant up or down only takes a day or so, so if the prices stay negative for entire days, probably there's some kind of perverse incentive where the coal plant operator is getting paid to run the plant by someone else who is also having to pay a consumer to consume the energy generated.