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CO2 supply-demand balance (t)
======

*indexed by asset, data type (Demand or Production), energy, node, technology and test case*

### Description

This KPI returns the volumes of energy consumed and produced over the entire simulation for every CO2 energy, node, asset, and technology of a given context.

The results indicated in this KPI are directly those of the optimization problem.
If an asset produces, it will appear in the *Production* tag of the "Data type" index.

For example, a storage asset may appear in both the *Production* and *Demand* tags, as it
consumes energy to store it and produces energy during its life cycle.

<blockquote class="custom-hint">
  <h4>Modelling hint</h4>
  
  Note that Voluntary Load Curtailment, which represents consumption curtailment, and Loss of
  Load, which represents failure, are modelled as production assets. They will therefore appear in the *Production* tag.
</blockquote>

This KPI is particularly interesting to understand the equilibrium between the national production and the national demand over a node for a given energy.

### Calculation

This KPI is calculated following the exact same equations as KPI [Supply demand balance](sdb.md), except for different energies: *co2* and *co2_captured*. Please refer to [this KPI's documentation](sdb.md) for calculus details.