->''"The electrician pulled the lever, and the current, slowly at first but growing faster and faster, started crawling down the wires."''
-->-- '''Russian joke, popular among physics students'''

In real life, the effects of electricity travel very fast - relatively close to the speed of light. As such, most power outages always strike near instantaneously and always strike an area.

In fiction, outages - or repowered structures - often come on light by light, system by system, dramatically, with a strange thumping noise. TruthInTelevision: this is known as a cascading failure when it is an outage, and systems often power up slowly if turned on via breaker.

Subtrope of YouFailPhysicsForever. Step-sister to SlowDoors. A product of RuleOfCool.
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!!Examples:

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[[folder: Advertising ]]

* In a Buffalo Wild Wings Grill and Bar commercial, a power plant is sabotaged and lights go out across a city in blocks.

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[[folder: Anime And Manga ]]

* The [[Anime/{{Pokemon}} Pokémon anime]] has Electric attacks being dodged very easily. Few Electric attacks miss as easily in the games, and the ones that do involve an electrified body part making contact. Shock Wave notably cannot miss.
** Though Thunder also has poor accuracy - except in rain. When, realistically, it should become a multi-hitting move in rain instead.
* [[ShockAndAwe Misaka Mikoto]] of ''LightNovel/ACertainMagicalIndex'' and ''Manga/ACertainScientificRailgun'' fights Touma a lot, and each time he is able to swing his [[AntiMagic right arm]] in the direction of the attack and block it entirely. Later explained as Touma [[spoiler:subconsciously using an ability to sense AIM Fields and predict her attacks.]] Touma doesn't know he's doing this, either; in the novels, he often remarks how fortunate [[note]]that right there should have been a clue that something more was going on, given his constant bad luck[[/note]] he is that her lightning always hits his hand.
* ''GhostInTheShellStandAloneComplex 2nd Gig'' episode "Embarrassment". At the end of the episode, the crew of a Coast Guard ship sees the lights of Nagasaki going out in sections after the city's power is cut, apparently by the refugees. Justified in that the city had many relay power stations holding up the entire grid, and when the cascade began, it was slowed down by each station's failsafes eventually giving out by trying to overcompensate for the adjacent stations.

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[[folder: Film ]]

* At the end of the first ''Film/BackToTheFuture'' film, the lightning crawls down the wire at roughly a walking pace.
** And no, no amount of Theory of Relativity at 88MPH will justify it. (Though being in a time machine, you do have some wiggle room)
* ''Film/{{Constantine}}''. When the title character and Angela Dodson are talking on the street, demonic influence causes the streetlights to turn off (with clunking sounds) - first far away, then approaching them.
* ''Film/TheDescent'': While a woman is in a hospital corridor, the lights go out at one end of the corridor and continue going out toward her, causing her to flee. This appears to be a hallucination sequence.
* ''Film/JurassicPark'' (first film): When the [[BigRedButton main switch]] is turned back on, the hall lights do this.
* ''Franchise/TheMatrix'' series
** ''Film/TheMatrixReloaded'': After the power station is destroyed (and later when Trinity turns off the power again), the blackout spreads slowly through the affected area.
** ''Film/TheMatrixRevolutions''. Inside the Oracle's apartment building, the overhead lights go off (with clunking sounds) as a warning of Agent Smith's approach. [[http://www.youtube.com/watch?v=1nHJS1ZB1LA#t=0m13s Watch it here]].
* The lights turning on one row at a time in the ''Film/MenInBlack'' post-credits [[DVDBonusContent music video]].
* The {{Bollywood}} movie ''Mohabbatein'' features a scene where a student is caught coming back to his room after curfew. He's walking in a dark hall when the light right over his head comes on, then the next one in the hall, then the next one... when the last light comes on, it reveals the headmaster starring at him disapprovingly.
* ''Film/OceansEleven'': When they use the EMP, there is the obligatory shot of the lights going out city block by city block.
** Averted in the original version, when Josh Howard blows up the powerline, the Sahara, Riviera, Desert Inn, Sands, and Flamingo all go dark at once.
* Even in the future, power is slow: In ''WesternAnimation/{{WALL-E}}'', the HardLight barriers in the holding cells fail sequentially instead of all at once.
* In the movie ''My Science Project'', the protagonists' car can and does go faster than the electricity running through power lines. This is a plot point, allowing them to cut off power that would have run to an alien spacecraft.
* At the end of ''Film/AddamsFamilyValues'', the electricity moving in the mass of wires flows so slowly that Pubert is able to crawl into the room and short-circuit the wiring, [[spoiler:saving his family from the electric chairs and electrocuting Debbie, who has thrown the switch]].
* The first ''Film/ResidentEvil'' film. When the Red Queen (and the power) are shut down and restarted in the first film, some areas and devices turn off (and light up again) at different times.
* In the 2009 ''Film/SherlockHolmes'' movie starring RobertDowneyJr and Jude Law, there is a scene where Holmes is fighting a giant man in an abandoned warehouse with the aid of an electric cattle prod. At one point his opponent is hanging on to a pipe on the wall for support, and Holmes touches the far end of the pipe with the cattle prod. Although it moves quickly the movement of the electricity (well, the magic blue sparks showing where the electricity is) as it races down the pipe is clearly visible.
* In ''Film/EighthWonderland'' a special ops team has tracked down the server farm hosting the "unwanted" virtual nation. After blowing it to smithereens, the video feeds of the users slowly fade away over the course of a minute.
* [[InvokedTrope Invoked]] by [[BigBad Syndrome]] in ''TheIncredibles'', since he has a weakness for designing his buildings with dramatic flair.

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[[folder: Literature ]]

* Aversion in ''[[Literature/DirkGentlysHolisticDetectiveAgency Long Dark Teatime of the Soul]]'' when Kate walks down the street and the street lights go out as she passes them. Turns out there's a reason for that.

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[[folder: Live Action TV ]]
* ''Series/DoctorWho'': Series 6, The Rebel Flesh, opening scene
* ''Series/{{Heroes}}'': In "Dual", when the lights go off in the Primatech medical facility's hallway. Possibly justifiable in that maybe [[spoiler:Sylar did it that way on purpose]].
* ''Series/{{Jericho}}'': We get the city power failure sequence at TheEndOfTheWorldAsWeKnowIt.
* ''New Adventures of {{Superman}}'': Explosives under a light-beam cage were deactivated by having Lois setting off the explosives and Superman destroy the wall panel circuit before electricity reached the destination. This is PostCrisis, so Superman is ''fast,'' but '''not''' "here to Alpha Centauri in three seconds" fast.
* ''NUMB3RS'': In one episode, the case involves several reactors being taken down in an attempt to create a cascading failure. The shot of the shutdown when it occurs is basically the same thing as most shows/movies show though, but it's a bit more valid then a full electrical failure causing the skyline shutdown sequence.
* ''Series/{{Revolution}}'': Technically an AvertedTrope in the [[Recap/RevolutionS1E1Pilot pilot episode]]: everything goes out in a single moment, not all at the exact same time, but pretty close. ...and then it spins back around to Creative License Science, since the "power outage" causes planes to immediately fall out of the sky, Smartphones and computer tablets to deactivate, and a good few blocks worth of cars to stop working altogether. (Creator/JJAbrams is involved - doubtlessly a lot of twists, retcons, and outright hand-waving are soon to follow).
* ''{{Smallville}}'': The episode "Idol". The Wonder Twins' attack on a criminal causes a blackout during which the lights of Metropolis turn off in segments.
* ''Franchise/StarTrek'':
** The console displays always came on/off this way. If there's a shipwide outage, expect an outside shot of windows lighting up this way. Usually, the last thing to come back is the engines. Also, the {{technobabble}}-laden ''Series/StarTrekTheNextGeneration'' was ''always'' having something about to undergo a 'cascade failure,' but it was pretty much never like this.
** Possibly a JustifiedTrope in that the starships in ''Star Trek'' use a plasma distribution system as their power grid, rather than modern-day electrical cabling.
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[[folder:Pinball]]
* In ''Pinball/JohnnyMnemonic'', the "Power Down" WizardMode starts with all systems enabled, but they shut down one by one as time progresses.
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[[folder: Video Games ]]
* Quite a few ''{{Minecraft}}'' contraptions end up working this way, but that's justified because it's difficult ''not'' to use a lot of repeaters in the not even electrical but "[[AppliedPhlebotinum redstone]]" circuits as the power gets further away from the input.
* Perhaps justified [[AWizardDidIt given the genre]], but [[VideoGame/FinalFantasyX dodging lightning]] by jumping out of the way seems {{egregious}} enough to be listed here.
* A puzzle in ''VideoGame/{{Myst}}'' begins this way when you flip on the lights in a certain underground chamber for the first time (understanding that it's electricity, and involves power-ups, overloads, and breaker switches, is crucial to solving the puzzle).
* Happens in ''VideoGame/DarkFall: Lost Souls'' when you restore power to Dowerton Station. Could perhaps be justified, if one assumes the wiring is defunct and supernatural forces are actually operating the lights as well as [[spoiler:the television sets]].
* ''VideoGame/{{Unreal}}'' has you fighting slow monters known as "brutes" for the first two levels, which are only really dangerous if you don't move. Later on you're merrily coming back from a hit-the-button mission, walking in a corridor, and suddenly the lights start to go out one by one. When the final one dies, [[spoiler:the game presents you with the ''real'' enemy - fast, hard to kill and quite dangerous - while you can't see a thing]]. Lots of crazed shooting at shadows usually ensues.
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[[folder: Web Comics ]]
* In ''ProblemSleuth'' electricity takes ''several hundred years'' to get across [[spoiler:the fan cord]] in order to [[spoiler:turn on the fan]]. However, this is {{justified|Trope}}, as, thanks to [[AWizardDidIt GPI]], [[spoiler:the fan cord now '''stretches across the entire length of the imaginary universe. Twice.''']] As the comic points out, electric current can only travel at the speed of light.

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[[folder: Western Animation ]]

* The animated version of ''ComicStrip/TheBoondocks''. In the episode "The Passion of Rev. Ruckus", as Uncle Ruckus is delivering a sermon he's struck by a lightning bolt. This causes the lights of the city to go out a section at a time, much like ''Film/TheMatrix'' example under "Film".[[/folder]]

[[folder: Real Life ]]

* What we think of as electricity is produced by, or at least related to, the motion of electrons. The electrons themselves have mass -- very little, but some -- so they cannot move at the speed of light. In fact, they move very slowly in wires, often on the order of several centimeters per hour. Current in a wire doesn't work by moving a single electron from point A to point B, however; it's more accurate to think of the electrons in the wire as many tightly-packed balls, or water molecules, or as beads joined in one big rope. If you push or pull on one end, electrons at the other end will move almost immediately. How quickly? At the speed of the propagation of electromagnetic fields, which is at the speed of light.[[note]]Actually in copper wiring, electricity travels about 1/3 the speed of light.[[/note]]
** Essentially, electricity could be considered to "move" at the speed of light or slower than a slug. Neither one is much like the speed shown in movies.
*** Alternating current has zero average movement, as it does not depend on the sheer speed of an electron moving from beginning to end (as in a battery), but instead is going back and forth 50 or 60 times per second (for house current). This allows easier change and manipulation in voltages (through using a static cheap transformer, which is basically an electromagnet that amplifies or decreases voltage when under alternating current, which it cannot do on DC) without the necessity for a faster current (which requires a faster generator and multiple sub-generators, hence why in Edison's time a substation was necessary for every city block).
*** This is also why AC ammeters first need to rectify the power into DC.
** Electrical signals in a living nervous system are even slower, as they're created by moving ions rather than electrons, and may have to cross synapses where the signal temporarily becomes chemical rather than electrical.
* One engineer working on the electronics of the then new B2 bomber invoked this trope for a demonstration by having the power indication lights of the various electronics turn on in sequence rather then simultaneously from a single master switch. This was either to limit power-on current or just to make a [[RuleOfCool more impressive visual presentation]].
* Lights in a big warehouse flickering on one at a time has reasons: first, if they use fluorescent lamps, they might take many seconds to warm up, and the warm-up time might differ between them. Second: said fluorescent lamps need vastly more current when turning on, so if you have a lot of them, it is wise to not turn them on all the same time: maybe you have current to supply all of them when they operate continuously, but your system would not survive if you turned them all on at the same time.
* The "electricity slowly disappearing one section of city/country at a time" trope may be TruthInTelevision. When one section of grid fails, the substations at the edges of the dark area try and re-balance the new loads (or lack thereof) across other circuits. This generally causes them to fail after a few seconds as well, so a new section goes dark. This continues outward from the point of failure until it reaches interconnects powerful enough to prevent any more outages.
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