A Pennsylvania energy infrastructure company is teaming up with three other Massachusetts firms to propose a $100-million liquified natural gas, storage and truck-loading facility in Charlton.

Liberty Energy Trust, Methuen-based natural gas engineering firm Northstar Industries, Maynard-based environmental engineering firm Epsilon Associates and Boston-based Nitsch Engineering hope to build a gas treatment and liquefaction system and storage tanks to hold 100,000 gallons.

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