HomeCalculatorsShaft-Generator / PTO Credit

Shaft-Generator / PTO Credit

Electric power produced from the main-engine shaft (PTO mode) instead of a running aux engine. Recognised EEDI Category-B credit under MEPC.1/Circ.815 and a common FuelEU saving.

DesignPTO

PTO operation

PTO electric output at reference loadkWPTO hours per year (or voyage)h

Reference aux

Aux engine SFOCg/kWhAux engine fuel (displaced)Main engine SFOCg/kWhSFOC of the ME supplying the shaft, which now consumes a bit more fuel under PTO load.Main engine fuel

Aux fuel displaced

672.00t

Extra ME fuel burned

560.00t

Net CO₂ saving

410.59t

Formula, assumptions, and limits

Net saving comes from SFOC_AE > SFOC_ME (two-stroke is more efficient than a four-stroke genset) AND potentially from fuel-Cf gap (HFO vs MGO). FuelEU typically treats PTO as ME fuel to the extent that the ME supplies the electrical load.