A framework for joint management of regional water-energy ... - Orbit

Net costs [10 6 EUR/year]
2000 CI Z Z
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Net costs [10 6 EUR/year]
2000 CI Z Z
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1000
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Figure 19. Convergence of a) disaggregated and b) aggregated model. (CI is the confidence
interval)
The mean storage was very similar in the aggregated and disaggregated models
(Figure 20a), and resulted from a policy of producing hydropower during
the winter and summer demand peaks. Although the releases also followed a
similar trend (Figure 20b), those from the aggregated model were higher from
May to July, because irrigation was prioritized. In contrast, releases from the
disaggregated model were higher during January–February and September–
October, at the expense of higher irrigation curtailments.
Energy storage [GWh]
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Disaggregated
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Energy releases [GWh/week]
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Figure 20. Total energy storage (a) and energy releases (b) in aggregated and disaggregated
models
Despite storage similarities between the models, the river basins from the
disaggregated model showed distinct storage strategies (Figure 21): storage in
Tajo, Ebro, Duero and Miño-Sil was released before the beginning of the inflow
season in October; whereas the storage in Guadalquivir, Guadiana and
Jucar was never depleted.
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