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CO2 cumulative production (t/h)
======

*indexed by: asset, asset_type, energy, node, technology, test_case*

### Description

This KPI directly returns the optimized CO2 and CO2 captured production variables of every concerned asset of the 
realization. It is intended for direct visualization of CO2 emissions and capture. For detailed indicators over CO2 
emissions and capture results and constraints please refer to [CO2 asset production KPI](co2_asset_production.md).

.. note::
  This KPI directly returns optimized production variables. This means, for instance, that for a storage asset, it
  displays its raw production without deducting any consumption.

### Calculation

The equation below is valid for any realization and is therefore implicitly indexed by test case. 

Let be $x_{a, e, n}(t)$ the value returned by the KPI for a given asset $a$, energy $e$ (among CO2 or CO2 captured) and
node $n$. The *technology* and *asset_type* (type of technology) indexes are directly deduced from asset's type.
We directly have :

$$
x_{a, e, n}(t) = p_{a, e, n}(t)
$$

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