A 31 year old man from Abertillery was sentenced to six years today after he pleaded guilty to setting fire to the Real Crisps factory in Crumlin in 2012.
Colin Goulding was told half of his sentence would be served on licence and he's already served 15 months while on remand.
Goulding admitted guilt to the second count of arson being reckless as to whether life is endangered.
The prosecution accepted the plea and said no trial would go ahead in line with the first count of arson with intent to endanger life.
Around a hundred people lost their jobs after the factory went up in flames. No one was injured in the blaze.
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North Wales Police said no one was injured, but they received a call saying there was a man with a firearm in Amlwch.