The US was a net exporter of natural gas in three of the first five months of 2017, bucking a trend which has lasted more than half a century, a new report said.
The US has been a net importer since 1958, when trade volumes were much smaller.
But this year net pipeline imports from Canada have declined, while exports to Mexico have increased in volume, according to the US Energy Information Administration (EIA).
The US has also enjoyed growth in its liquefied natural gas (LNG) exports.
As a result, the US was a net exporter in February, April and May.