Asset surplus (€)
======

*indexed by: asset, cost_type, node, technology, test_case*

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### Description

The KPI computes the asset surplus of each asset, i.e., the revenues received by a given asset minus its costs over the
entire optimization horizon.

### Calculation

Let be $x_{a, n}$ the asset surplus of asset $a$ at node $n$.
We can then express $x_{a, n}$ as:

$$
x_{a, n} = ar_{a, n} - ac_{a, n}
$$

With:

- $ar_{a, n}$ : the asset revenues of asset $a$ at node $n$
- $ac_{a, n}$ : the asset costs of asset $a$ at node $n$

For more detailed explanations on how [asset revenues](../temporal_kpis/asset_revenues_view.md) and 
[asset costs](../temporal_kpis/asset_costs_view.md) are computed please refer to their documentation pages.

*Global variables and parameters notations definitions can be consulted [here](../notations.md).*

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