How can changing when electricity is used help a power system?

Electricity use rises and falls as many people switch equipment on and off. At a busy moment, the power system must supply a high rate of energy transfer. Some uses can be delayed without stopping the service they eventually provide.

Demand-response programs ask or arrange for participating users to change consumption at particular times. A building might temporarily reduce a flexible load, or a charging system might wait until a crowded period has passed.

Moving some use away from a peak can reduce the highest demand the grid must meet at once. The delayed equipment may still use energy later. Lower peak power is therefore different from lower total energy.

Coordinating these changes requires communication, suitable incentives and respect for the user’s needs. Essential or inflexible loads cannot simply be postponed. The system gains flexibility when many small, practical timing changes can be combined with generation, storage and network operation.