# The Potential for the Use of Hydrogen Storage in Energy Cooperatives
## 4 Results and Discussion
Figure 3: A change in storage capacity as a function of average energy demand for CASE_1A vs. CASE_0 for randomly selected cooperatives. (by 105%), which is also linked to a 92% increase in storage capacity from 16.16 MWh (virtual grid storage) to 30.984 MWh (hydrogen storage). In order to confirm the relationship and examine it at a general level, a simulation was carried out for energy cooperatives of different sizes with a random selection of participants. The analysis of the results, including the relationship of the change of energy storage capacity [%] as a function of mean yearly demand [MWh] for CASE_1B vs. CASE_0, is shown in Figure 5 along with the distribution of quantiles shown in Table 6. The results confirm that different degrees of concentration and symmetry were achieved depending on the number of participants, and  
The results presented are complemented by the change of source size [%] as a function of mean yearly demand [MWh], for CASE_1A vs. CASE_0, which is shown in Figure 6, while the quantiles of the distribution are shown in Table 7. Regardless of the type of generating source used, satisfying the CASE_1A criterion requires a significant increase in its capacity. For a cooperative of 40 members, the percentage change in source capacity for the mix, PV, and wind scenarios is 230%, 210%, and 175%, respectively. Increasing the capacity of a generating source (CASE 1B/CASE1A) effectively reduces the hydrogen storage capacity regardless of the type of source (PV/WIND). For the variant with PV sources, a reduction in hydrogen storage capacity from 26.77 MWh to 19.019 MWh (by 29%) is possible if we increase the source capacity from 69.873 kW to 92.016 kW (by 32%). Similar calculations for the variant with wind sources indicate that it is possible to reduce the storage capacity from 12.713 MWh to 2.89 MWh (by 77%) thanks to oversizing the source capacity from 53.238 kW to 81.005 kW (by 52%). For the hybrid scenario combining both generation technologies, a reduction in storage capacity from 12.101 MWh to 1.326 MWh (by 89%) becomes possible if we increase the total capacity from 47.751 kW to 91.565 kW (by 92%). \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \(\mathbf{src}\backslash\mathbf{Quantile}\) & \(\mathbf{q}\)**0\%** & \(\mathbf{q}\)**10\%** & \(\mathbf{q}\)**20\%** & \(\mathbf{q}\)**30\%** & \(\mathbf{q}\)**40\%** & \(\mathbf{q}\)**50\%** & \(\mathbf{q}\)**60\%** & \(\mathbf{q}\)**70\%** & \(\mathbf{q}\)**80\%** & \(\mathbf{q}\)**90\%** & \(\mathbf{q}\)**100\%** \\ \hline mix & 222.77 & 227.31 & 228.47 & 229.27 & 229.98 & 230.45 & 231.06 & 231.64 & 232.53 & 234.02 & 252.33 \\ pv & 206.02 & 209.49 & 209.76 & 209.85 & 209.90 & 209.94 & 209.97 & 210.01 & 210.05 & 210.11 & 210.80 \\ wind & 160.75 & 170.84 & 172.77 & 173.70 & 174.43 & 174.99 & 175.57 & 176.36 & 177.46 & 182.56 & 210.66 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Quantiles of distribution—the relationship of the change of source size [%] as a function of mean yearly demand [MWh] for CASE_1A vs. CASE_0. Figure 6: A change in generating source capacity as a function of average energy demand for CASE_1A vs. CASE_0. The results obtained for cooperatives EC2-EC4 are presented in a similar manner in Table 8.  
The results of the analyses for other structures of cooperatives EC2-EC4 allow us to draw conclusions directionally consistent with those for EC1. The technical feasibility, for any scenario and type of a generating source, to substitute a grid storage with a physical hydrogen storage is confirmed. The most beneficial generation-storage structure considering the balance of source capacity and storage capacity occurs in the MIX scenario, which assumes the presence of both types of generating source. For the case that assumes minimizing the storage capacity, it is necessary to increase the total capacity of the sources around twice to be able to obtain around a four-fold reduction in storage capacity.