Excelerate Energy has honed down the list of potential partners at its $1.75 billion Port Lavaca floating LNG production project in the US.Talks are continuing with just a handful of off-takers for the 4 million tonnes per annum unit, according to sources. Final agreements, which are likely to be on a tolling basis, are expected to be signed with one or more parties by the end of this year or early in 2013.In