Auxiliary Fuel Use

The document provides technical instructions for using auxiliary fuels in LEAP's Transformation processes. It distinguishes auxiliary fuels from feedstock fuels by noting they are not converted and do not affect overall process energy efficiency. The guide details how to configure 'own use' consumption via module properties and explains how LEAP handles fuel requirements through its hierarchical module structure and iterative calculations for feedback flows.

• Auxiliary fuels are defined as energy consumed per unit of energy produced or consumed in a process and differ from feedstock fuels because they are not converted, meaning their energy content is excluded from the process's overall energy efficiency calculations.
• Users can configure a Transformation module to meet its auxiliary fuel needs from its own outputs by enabling the 'Meet auxiliary fuel use from this module's outputs (where possible)' option in the Properties screen.
• When 'own use' fuel consumption is enabled, these fuels do not appear in standard energy balance reports because they are internal to the process; however, they can be tracked using the 'Outputs by Output Fuel' and 'Inputs' reports in Results View.
• LEAP manages fuel requirements by defaulting to supplies from lower-level transformation modules or imports, but it uses iterative calculations for 'feedback flows' when a lower module consumes fuel produced by a higher module, such as an oil refinery consuming electricity.

APA

Stockholm Environment Institute (n.d.). Auxiliary Fuel Use. https://leap.sei.org/Help24/Transformation/Auxiliary_Fuel_Use.htm

Chicago

Stockholm Environment Institute. Auxiliary Fuel Use. n.d. https://leap.sei.org/Help24/Transformation/Auxiliary_Fuel_Use.htm.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Auxiliary Fuel Use |url=https://leap.sei.org/Help24/Transformation/Auxiliary_Fuel_Use.htm |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendauxiliary, author = {{Stockholm Environment Institute}}, title = {{Auxiliary Fuel Use}}, institution = {Stockholm Environment Institute}, url = {https://leap.sei.org/Help24/Transformation/Auxiliary_Fuel_Use.htm}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }