Stock Analysis Calculations

This guide describes the mathematical methodology used by the Stockholm Environment Institute's LEAP software to calculate stock turnover, energy intensity, and energy consumption for demand technologies.

• The stock analysis methodology calculates stock turnover based on the technology type, vintage year, calendar year, sales (entered as an expression), stock (either an expression for Current Accounts or calculated from historical sales), and survival (entered as a lifecycle profile). The maximum number of vintage years is automatically determined from the survival lifecycle profile, capped at 30 years.
• Energy intensity for a technology is calculated using the energy use per device for new devices purchased in a specific year (entered as an expression) and a degradation factor (entered as a lifecycle profile) that represents the change in energy intensity as the technology ages, equaling 1 when the calendar year matches the vintage year.
• The system calculates energy consumption and energy-based emissions, such as CO2 and other Greenhouse Gases, with the resulting emission data displayed in the Results View.

APA

Stockholm Environment Institute (n.d.). Stock Analysis Calculations. https://cdn.leap.sei.org/Help24/Demand/Stock_Analysis_Calculations.htm

Chicago

Stockholm Environment Institute. Stock Analysis Calculations. n.d. https://cdn.leap.sei.org/Help24/Demand/Stock_Analysis_Calculations.htm.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Stock Analysis Calculations |url=https://cdn.leap.sei.org/Help24/Demand/Stock_Analysis_Calculations.htm |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendstock, author = {{Stockholm Environment Institute}}, title = {{Stock Analysis Calculations}}, institution = {Stockholm Environment Institute}, url = {https://cdn.leap.sei.org/Help24/Demand/Stock_Analysis_Calculations.htm}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }