The term blackout in peacetime refers to a cessation of Electrical energy or Electromagnetic energy is a form of energy present in any electric field or magnetic field, or in any volume containing electromagnetic radiation. ...electrical energy through Transmission towers Transmission lines in Lund, Sweden Electric power transmission, or more accurately Electrical energy transmission, is the second process in the delivery of electricity to consumers. ...electric power transmission systems. In wartime it can also mean the minimizing of external light sources.

In general during peacetime, a blackout is an unintentional total electrical A power outage is the loss of the electricity supply to an area. ...power outage. It is sometimes contrasted with the term A power outage is the loss of the electricity supply to an area. ...brownout which is a reduction in power, and selected power outages, when demand exceeds supply (see Rolling blackout refers to an intentionally_engineered electrical power outage, caused by insufficient available resources to meet prevailing demand for electricity. ...rolling blackout).

However a blackout can be intentional, for instance collectively minimizing external Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye, or in a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. ...light (during For other uses of War, see War (disambiguation). ...war), including upwards directed (or The reflection of sunlight on water Reflection is the abrupt change in direction of a wave front at an interface between two dissimilar media so that the wave front returns into the medium from which it originated. ...reflected) light, to "hide" from An enemy or foe is a relativist term for an entity that is seen as forcefully adverse or threatening. ...enemy aircraft (in the case of an occupied country: the enemy of the occupying force). Additionally, intentional blackouts can be used in coastal regions to prevent city lights from outlining ships (shore-side blackouts). This makes ships hard for An enemy or foe is a relativist term for an entity that is seen as forcefully adverse or threatening. ...enemy USS Los Angeles A submarine is a specialized watercraft that can operate underwater. ...submarines to detect.

See also

• A massive power outage produced a United States and eastern Canada on August 14, 2003. ...2003 North America blackout
• The Northeast Blackout of 1965 was a significant disruption in the supply of electricity on November 9, 1965 affecting Ontario, Canada and Connecticut, Massachusetts, New Hampshire, Rhode Island, Vermont, New York, and New Jersey in the United States. ...Northeast Blackout of 1965
• In the military, a communications blackout occurs when a military unit decides not to use radios in an attempt to hide from the enemy. ...communications blackout
• This is a list of famous wide_scale power outages The Northeast Blackout of 1965 on November 9, 1965. ...List of power outages
• HVAC may also stand for High_voltage alternating current HVAC is an initialism that stands for heating, ventilation and air_conditioning. This is sometimes referred to as climate control. ...Indoor climate control (air conditioning) can generate an excess of demand.
• Renewable energy (sources) or RES includes all sources of energy that are captured from on_going natural processes, such as solar power, wind power, water flow in streams (hydro power), biomass, biodiesel and geothermal heat flows. ...Renewable energy to supply aditional energy.

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