A load of electricity dumped into the power grid has to go somewhere, just like water pumped into the water grid has to go somewhere. If there is insufficient demand (people taking stuff out) then it’s possible for the input pressure (however manifest), to damage the grid - at great repair cost. Cheaper sometimes to pay people to take power (water, whatever) out of the system just to ensure the distribution system doesn’t get damaged. Blown transformers are a whole lot more expensive to replace than paying people to use more power for a while.
(Yes, that’s a paraphrase. The exact details are needlessly complicated for the purposes of this thread.)
Read the article...the wind generators weren’t taking a loss. Tax credits altered the energy market.
Please define the “input pressure”.