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The remainder came from Trinidad and Tobago, which had been Chile's main supplier before the US began exporting LNG earlier this year.
Total natural gas imports rose 2.1% year-on-year in September, as output from Chile's thermal plants replaced declining hydropower amid historic drought.
The US overtook Trinidad as Chile's No. 1 gas supplier in August.
Chile imports LNG via the Mejillones and Quintero (pictured) regasification terminals.