(A - E) (F - J) (K - O) (P - T) (U - Z)

  • Layoff : Excess capacity of a generating unit, available for a limited time under the terms of a sales agreement.
  • Levelized : A lump sum that has been divided into equal amounts over period of time.
  • Lightning Arrestor : This protects lines, transformers, and equipment from lightning surges by carrying the charge to the ground. Lightning arrestors serve the same purpose on a line as a safety valve on a steam boiler.
  • Line : A line is a system of poles, conduits, wires, cables, transformers, fixtures, and accessory equipment used for the distribution of electricity to the public.
  • Load : The amount of electric power delivered or required at any specified point or points on a system. Load originates primarily at the power consuming equipment of the customer.
  • Load Building : Programs aimed at increasing use of existing electric equipment or the addition of new equipment.
  • Load Centers : A limited geographical area where large amounts of power are used by customers.
  • Load Diversity : The condition that exists when the peak demands of a variety of electric customers occur at different times. This is the objective of "load molding" strategies, ultimately curbing the total capacity requirements of a utility.
  • Load Duration Curve : A curve that displays load values on the horizontal axis in descending order of magnitude against percent of time (on the vertical axis) the load values are exceeded.
  • Load Factor : The ratio of the average load supplied to the peak or maximum load during a designated period. Load factor, in percent, also may be derived by multiplying the kWh in a given period by 100, and dividing by the product of the maximum demand in kW and the number of hours in the same period.
  • Load Forecast : Estimate of electrical demand or energy consumption at some future time.
  • Load Management : Influencing the level and shape of demand for electrical energy so that demand conforms to present supply situations and long-run objectives and constraints.
  • Load Profile : Information on a customer's usage over a period of time, sometimes shown as a graph.
  • Load Ratio Share : Ratio of a transmission customer's network load to the provider's total load calculated on a rolling twelve-month basis.
  • Load Shape : A curve on a chart showing power (kW) supplied (on the horizontal axis) plotted against time of occurrence (on the vertical axis), and illustrating the varying magnitude of the load during the period covered.
  • Load Shifting : A load shape objective that involves moving loads from peak periods to off-peak periods. If a utility does not expect to meet its demand during peak periods but has excess capacity in the off-peak periods, this strategy might be considered.
  • Loss of Load Probability (LOLP) : A measure of the probability that system demand will exceed capacity during a given period; this period is often expressed as the expected number of days per year over a long period, frequently taken as ten consecutive years. An example of LOLP is one day in ten years.
  • Losses : The general term applied to energy (kWh) and capacity (kW) lost in the operation of an electric system. Losses occur principally as energy transformations from kWh to waste-heat in electrical conductors and apparatus. This waste-heat in electrical conductors and apparatus. This power expended without accomplishing useful work occurs primarily on the transmission and distribution system.
  • Low Heat Value (LHV) : The low or net heat of combustion for a fuel assumes that all products of combustion, including water vapor, are in a gaseous state.

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