Our sustainable aviation fuel (SAF) is produced with the HEFA (Hydrotreated Esters and Fatty Acids) technology. On this page you can learn everything about this technology and we will explain how SkyNRG’s SAF is produced and delivered into the plane: from feedstock to flight. If you want to learn more about other technologies to produce sustainable jet fuel, you can visit our Technology section.


Producing sustainable aviation fuel starts with sourcing sustainable feedstock. As most of the sustainability impacts of biofuels are linked to the feedstock, we have chosen to focus on waste oils like used cooking oil.


Before the feedstock is ready for refining, it must be prepared. Impurities have to be removed from the waste-oils, or the oil has to be extracted from the fruits or seeds. The pre-treatment process results in waste- and vegetable oils that are ready for refining into sustainable aviation fuel.


Now that the feedstock is pre-treated, the waste-oils are ready to be converted into high-quality sustainable aviation fuel. This conversion is a chemical process taking place in a refinery.


Once the HEFA fuel has been produced and certified, it needs to be blended with fossil jet fuel to conform to the jet fuel specifications. Currently, blends with up to 50% of HEFA jet fuel are allowed.


There are two main steps within the certification process of sustainable aviation fuel (SAF) blend. The first one is the certification of the HEFA SAF according to the ASTM specification for jet fuels containing synthetic hydrocarbons, right after its production. The second one is the recertification of the blended SAF to the ASTM specification for standard jet fuel.

Into Wing

At SkyNRG we deliver sustainable aviation fuel, from feedstock to flight. Depending on the airport and the wishes of the customer, the refuelling takes place via an underground pipeline network or with a (dedicated) refueler truck.