This sentence is from Digimon Adventure episode 10.
It seems like some kind of 終助詞 but I'm not sure. What is that?
The prior dialogue is:
He wishes for a source of electricity because they are in some old ruins.
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I guess it's one (less standard) way to transcribe the particle in speech that's normally written as って. The lack of っ might have to do with ん not ending with a vowel.
It may be seen more often in transcriptions of western dialects, but not exclusively.
The author (辻村伊助) was from Kanto as far as I can see.