Well-to-Tank

Well-to-tank is the upstream half of the life-cycle boundary, covering greenhouse gases released in extracting, cultivating, refining, liquefying, and transporting a fuel before it reaches the ship’s tank. It is what separates the climate value of a fossil and a renewable batch of the same molecule: e-methanol and grey methanol burn identically tank-to-wake but differ sharply well-to-tank. The IMO LCA Guidelines (MEPC.391(81)) and FuelEU Maritime assign default well-to-tank factors per pathway, with certified actual values allowed for some renewable fuels.