Open Access
Table 1
Discrete variables of the model depending on time 
, with tf a positive integer as the time horizon of a run.
| PV panel number variables |  |
|---|---|
| m(t) | yearly productivity of the PV panels factory |
| mr (t) | yearly productivity of the recycling factory |
| N (t) | number of PV panels |
| Nooo(t) | number of broken panels |
| Energy variables |  |
| yppv (t) | yearly PV energy production |
| ypff(t) | yearly fossil fuel production |
| ycf(t) | yearly energy consumption of the PV panels factory |
| yce(t) | yearly energy consumption of mining extraction |
| ycr (t) | yearly energy consumption of the recycling factory |
| Sy (t) | stock of fossil energy |
| D(t) | energy demand of the grid |
| Matter variables |  |
| XCf (t) | yearly material consumption |
| Xpe(t) | yearly extraction of raw material |
| XPr (t) | yearly material recycling |
| Sx (t) | stock of raw material |
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