Any knowledgeable sifters know how that happens?
-edit-
What trips me out is why does the arc travels so slow? Matter of fact why does it travel at all?

I am gonna guess that that arcing along the lines was a dead short and it arced until the transformer on that pole @:42 exploded. The sound of arcing electricity continues after the transformer blew so until the power stops traveling (melts wires/breaks continuity or power along grid is shut off/destroys itself), it continues.
2013 and we still use wires above ground....y'oud think we'd be further along-Thank the J.P. Morgan types of the world for arcane tech they can still milk for greenbacks.

Whoa!

*promote

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Plasma conducts electricity, so in that circumstance it can become self sustaining by shorting out the two wires. It must have had enough resistance to avoid blowing the fuse. I'm not really sure why it's moving though, perhaps magnetic effects? Wind? Down-hill?

Anyone?

Could be burning out the aluminium and just using that as fuel along the line..?

Reminds me of the Johnny Quest episode with the invisible energy monster.

Deals from 1 to 3056 points of lightning damage.

If the wires were insulated it could have been using the smoke in the air to jump between the lines. As the insulation burns off in one spot, the area next to it turns to smoke and the arc moves there.

Try lighting a match in the microwave and then putting a jar over it and quickly turning the microwave on and you'll see a similar effect

Plasma with help from smoke maybe!

Eric3579 i found this video for you http://www.youtube.com/watch?v=g7OopQjfDEY

"OMG. That is not cool."

No, it is FUCKING AWESOME...

that was totally close encounters

Electrical monster monster says "Weeeeeeeeeeeeeeeeeeeeeeeeeeeeee"

Look up magnetic blowout.

The plasma moves because of the magnetic fields. I think, just like when you energize a coil and a metal rod moves one direction to ring a doorbell.

See, Mr. Tesla, THIS is why we can't have anything nice!

Might be a good time to plug out the electrical appliances I reckon.