“A snapshot of the amount of electric power required to meet customers’ demand at a given time, expressed in kilowatts (kW) or Megawatts (MW).” (AECT)

Additionally, from Memphis Light, Gas, and Water (MLGW): At any given moment, the actual amount of power a customer is using is that customer’s load. Peak load is the highest amount of electricity drawn from the utility during a given increment of time—for example, per month, per day, or per hour. Each utility must plan to have the capacity needed to satisfy the anticipated peak load on its system at any time.