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Sustainability 2022, 14, 10125 With the aim to make the effect on the electricity exchange more evident to the reader, Figures 8 and 9 were included to demonstrate the behaviour of the electricity bought and sold throughout a year. Figure 8 represents the electricity exchange between the EC and the electric grid for the scenario without sharing electricity (ECS), while Figure 9 repre- sents the scenario with sharing electricity (SES). Since the hourly behaviour of an entire year is represented by 12 months made of two typical days each (working and non-work- Figure 8. Total electricity bought and sold by all EC users together (ECS scenario—without shar- Figure 8. Total electricity bought and sold by all EC users together (ECS scenario—without sharing ienlgecetlreicittryic)i.ty). 3000 2500 2000 1500 1000 500 0 Energy Community WITH Sharing Electricity 22 of 39 ing days), the total number of hours presented in both graphs is 576. kWh kWh Sustainability 2022, 14, 10125 24 of 41 3000 2500 2000 1500 1000 500 0 Total electricity bought Total electricity sold Energy Community WITHOUT Sharing Electricity 64 128 192 256 320 hours 384 448 512 576 Electricity bought Electricity sold 64 128 192 256 320 hours 384 448 512 576 Figure9.TotallellectriiciityboughttandsolldbyttheDS((SESsscenarriio—wiitthsshaarriingeelleeccttrriicciitty)).. Another crucial aspect to bear in mind is that the curves in Figure 8 represent the total Another crucial aspect to bear in mind is that the curves in Figure 8 represent the electricity bought and sold by all users together. In other words: total electricity bought and sold by all users together. In other words: • Total electricity bought curve (blue one) → summation of the electricity bought hourly • Total electricity bought curve (blue one)summation of the electricity bought by each building; hourly by each building; • Total electricity sold curve (orange one) → summation of the electricity sold hourly • Total electricity sold curve (orange one)summation of the electricity sold hourly also by each building. also by each building. Figure 9 also represents the total electricity bought and sold by the EC. However, Figure 9 also represents the total electricity bought and sold by the EC. However, there is a vital difference here. Since Figure 9 represents the EC with sharing electricity, there is a vital difference here. Since Figure 9 represents the EC with sharing electricity, the users have no direct connection with the main electric grid. Instead, as described in the users have no direct connection with the main electric grid. Instead, as described in Section 2.3, the users are all connected to a distribution substation (DS) which manages Section 2.3, the users are all connected to a distribution substation (DS) which manages the connection with the electric grid, i.e., the processes of buying and/or selling all the the connection with the electric grid, i.e., the processes of buying and/or selling all the electricity demanded and/or produced by the EC. In other words, Figure 9 represents: electricity demanded and/or produced by the EC. In other words, Figure 9 represents: • Electricity bought curve (blue one) → total electricity bought by the DS; • Electricity bought curve (blue one)total electricity bought by the DS; • Electricity sold curve (orange one)total electricity sold by the DS. By comparing Figures 8 and 9, the effect of the presented sharing electricity method- ology is evident. The total electricity sold in Figure 8 (without sharing electricity) is more prominent if compared with the equivalent curve in Figure 9 (with sharing electricity).PDF Image | Optimal Sharing Electricity and Thermal Energy
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