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A Methane Refinery is a large Covenant structure that produces methane tanks. They are located in the Halo Wars level Relic Approach on the west part of the map near the Forerunner Relic. There are a total of three refineries and many methane tanks surround them. Destruction of all refineries removes the Covenant's ability to send in dropships.
- In the level Relic Approach, one of the optional objectives is to destroy the Methane Refineries.
- Destroying all the methane tanks near the refineries unlocks the Endless Fun Achievement.