---
title: Investments
description: This page shows how to determine the investments flowing into the calculations.
license: AGPL
---

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Investments
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Generally, investments are input by the user in the measure-specific template. However, a default assumption needs to be calculated as default for the template and in case the user does not use the template:

A. If $`I_{{\rm user\_input}, c, ss, a, y} \neq NaN`$:
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$`I_{c, ss, a, y} = I_{{\rm user\_input}, c, ss, a, y}`$

B. If $`I_{{\rm user\_input}, c, ss, a, y} = NaN`$:
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$`I_{c, ss, a, y} = \Delta E_{c, ss, a, y} \cdot k_{{\rm I/ktoe}, a} `$

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$`I_{c, ss, a, y}`$ = investments for a given row in the front end

$`I_{{\rm user\_input}, c, ss, a, y}`$ = user input of investment costs from measure-specific parameter template

$`\Delta E_{c, ss, a, y}`$ = user input of energy savings of the same row in the front end

$`k_{{\rm I/ktoe}, a, y} `$ = investments per saved ktoe (id_parameter=41, source e3m, /public/e3m/investments_per_ktoe.xlsx)