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Cumulative production (MW)
======

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

### Description

This KPI directly returns the optimized energy production variables of every concerned asset of the realization. It is 
intended for direct visualization of energy production mixes. For visualization purpose, energy consumption of storage 
and transmission assets are included in this indicator as negative values. For detailed indicators over production 
results and constraints please refer to [Asset production KPI](asset_production.md).

### 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 $e$ and node $n$. The *technology*
and *asset_type* (type of technology) indexes are directly deduced from asset's type.

For assets only producing energy $e$ at node $n$ we have :

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

For transmission or storage assets both producing and consuming energy $e$ at node $n$ we have:

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

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