Charter rates for spot trading tri-fuel diesel-electric (TFDE) LNG carriers are climbing as the availability of their larger, more modern two-stroke cousins evaporates.

Shipbroker Clarksons said average spot earnings for a 160,000-cbm LNG carrier jumped 39% in the last week to $81,500 per day.

The broker cited the requirement for west-east voyages and the limited tonnage available.