Endogenous Capacity Expansion Calculations

This guide explains the mathematical logic and sequence LEAP uses to calculate endogenous capacity expansion, focusing on how the system determines the amount of capacity needed to meet peak power requirements and maintain a planning reserve margin.

• LEAP determines the existing capacity before additions by summing exogenous capacity and endogenous capacity added within the previous lifetime years, then multiplying by a 'Capacity Value'. This Capacity Value adjusts for intermittent renewable energy processes, which are considered to have less capacity value than thermal power plants, the latter of which typically have a value of 100%.
• The system calculates peak power requirements based on total energy requirements and the module load factor (either entered as data or derived from a load curve). The required endogenous capacity additions are then determined by the difference between the Planning Reserve Margin and the Reserve Margin Before Additions, multiplied by the Peak Requirement.
• Endogenous capacity is added to specific processes in the order they appear on the Endogenous Capacity screen. Capacity is added in increments defined in the 'Addition Size' column until the total added meets or exceeds the calculated Endogenous Capacity Additions Required.

APA

Stockholm Environment Institute (n.d.). Endogenous Capacity Expansion Calculations. https://leap.sei.org/help24/Transformation/Endogenous_Capacityu_Expansion_Calculations.htm?agt=index

Chicago

Stockholm Environment Institute. Endogenous Capacity Expansion Calculations. n.d. https://leap.sei.org/help24/Transformation/Endogenous_Capacityu_Expansion_Calculations.htm?agt=index.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Endogenous Capacity Expansion Calculations |url=https://leap.sei.org/help24/Transformation/Endogenous_Capacityu_Expansion_Calculations.htm?agt=index |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendendogenous, author = {{Stockholm Environment Institute}}, title = {{Endogenous Capacity Expansion Calculations}}, institution = {Stockholm Environment Institute}, url = {https://leap.sei.org/help24/Transformation/Endogenous_Capacityu_Expansion_Calculations.htm?agt=index}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }