Peak demand

Peak demand

Peak demand is used to refer to a historically high point in the sales record of a particular product. In terms of energy use, peak demand describes a period of strong consumer demand.


Peak load

Peak demand, peak load or on-peak are terms used in energy demand management describing a period in which electrical power is expected to be provided for a sustained period at a significantly higher than average supply level. Peak demand fluctuations may occur on daily, monthly, seasonal and yearly cycles. For an electric utility company, the actual point of peak demand is a single half hour or hourly period which represents the highest point of customer consumption of electricity.


Peak demand is considered to be the opposite to off-peak hours when power demand is usually low.

There are off-peak time-of-use (TOU) rates.


Typical daily consumption of electrical power in Germany

Peak demand may exceed the maximum supply levels that the electrical power industry can generate, resulting in power outages and load shedding. This often occurs during heatwaves when use of air conditioners and powered fans raises the rate of energy consumption significantly. During a shortage authorities may request the public to curtail their energy use and shift it to a non-peak period.

Power stations

Power stations providing power to electrical grids for peak demand are called peaking power plants or 'peakers'. Natural gas fueled power stations can be fired up rapidly and are therefore often utilized at peak demand times. Pumped storage type dams such as Carters Dam are used to meet peak demand as well.

See also


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Peak Demand —   Maximum power used in a given period of time.   ***   The maximum load during a specified period of time.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary   ***   See Peak load.   California Energy Comission.… …   Energy terms

  • Peak Demand/Load —   The maximum energy demand or load in a specified time period …   Energy terms

  • Peak load; Peak demand —   The maximum load, or usage, of electrical power occurring in a given period of time, typically a day.   Solar Electric Glossary …   Energy terms

  • Instantaneous peak demand —   The maximum demand at the instant of greatest load.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

  • System Peak Demand —   The highest demand value that has occurred during a specified period for the utility system …   Energy terms

  • Metered peak demand —   The presence of a device to measure the maximum rate of electricity consumption per unit of time. This device allows electric utility companies to bill their customers for maximum consumption, as well as for total consumption.   U.S. Dept. of… …   Energy terms

  • time of peak demand — /ˌtaɪm əv pi:k dɪ mɑ:nd/ noun the time when something is being used most …   Marketing dictionary in english

  • time of peak demand — /ˌtaɪm əv pi:k dɪ mɑ:nd/ noun the time when something is being used most …   Dictionary of banking and finance

  • Demand response — This article is about the electrical concept. For the transport concept, see Demand responsive transport. A clothes dryer using a demand response switch to reduce peak demand In electricity grids, demand response (DR) is similar to dynamic demand …   Wikipedia

  • Peak Pricing — A form of congestion pricing where customers pay an additional fee during periods of high demand. Peak pricing is most frequently implemented by utility companies, who charge higher rates during times of the year when demand is the highest. The… …   Investment dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”