To the electric utility, demand represents the amount of electrical power that must be available to consumers at any given time. To the consumer, demand represents how fast they use energy and how efficiently they use it.
Demand is the amount of power needed to supply every electrical device running in your home or business at a specific point in time. The example below may help clarify the difference between energy consumption (kWh) and demand (kW).
You will see that while the consumption (usage) is the same in both examples, the demand is greater in the example on the right.