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CO2 asset consumption (t/h)
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*indexed by: asset, energy, node, technology, test_case*

### Description

This KPI directly returns the optimized consumption variables of every CO2 or CO2 captured consuming asset of the
realization. For energy consumption please refer to associated [Asset consumption KPI documentation](asset_consumption.md).

### Calculation

All the equations below are valid for any realization and are therefore implicitly indexed by test case. Index 
*Technology* is directly deduced from the asset. 

Let $x_{a, e, n}$ be the value returned by this KPI for a given asset $a$ consuming energy $e$ (either CO2 or CO2 
captured) at node $n$, we directly have :

$$x_{a, e, n} = c_{a, e, n}$$

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