Grid stability is brought to you by having reserve capacity available to adapt offer (mainly) to demand at all times. It can adapt to variable offer as well.

Reserve capacity is something that needs to be managed on a system-wide basis, not on a plant by plant basis, otherwise it becomes horribly expensive - for all types of producers. This is the core mistake anti-wind opponents do about the cost of intermittency of wind - what matters is not the absolute intermittency of wind, but the additional cost it imposes on the system (which already has to deal with large intra-day variability and with possible incidents at very large plants like nukes). Practice tells us that this additional cost has consistently been overestimated.

Wind power