The trades are based on the weekly report from the Energy Information Administration (EIA) – the US Department of Energy’s statistical arm – detailing the net change in working natural gas in storage in the US. So far, the transactions have been for a one-off, day-of-release, no-revisions payment, based on the first figure released.

GFI says this new type of deal is catching on fast – in the week since the first trade settled in May, it has done several others like it. Certainly, Centaurus