Net Cost

The first global metric computed by the cost bus is *net cost over time*; i.e., simply the sum of all cost components:

$$\mathcal{C}\_{nct}(t) = \sum\_{\tau=0}^{t} \left( c\_{elec}(\tau) \right) + \sum\_{i} \left( \mathcal{C}\_{capital,i}(t) + \mathcal{C}\_{operation,i}(t) \right) \tag{7}$$

including, thus, time-dependent capital costs, operation and maintenance costs, and the cost of electricity until time *t*. Notice that the total electricity cost is obtained by integrating (summing) the *celec* component over the time interval [0, *t*], whereas the other components already include the time interval in their definition.
