## 5 Hydraulic and Energetic Behavior
Both net energy production and the capacity factor were calculated. The latter is defined as the ratio between the actual energy generated by the plant during an annual period and the energy generated if it had been working at full-load during that same period, according to the nominal values of the equipment. This rate is used as an index of the real use of the capacity of the facility in terms of time. Results are shown in Table 10. They reveal that the installation of any of the devices would obtain a quantity of reasonable energy, although the installation of an SSG in the Torres breakwater is not the most convenient option. It is observed that the capacity factors of the OWC are close to those of the wind farm (20-40%) [33], although the lowest ranges do not reach 2000 h per year. In the installation of SSG in any of the study points, the ranges are more widely extended, since the operation of this device depends more strongly on the maritime climate at the site. Data were based on an evaluation of the historical evolution of annual electricity consumption in the period 2011-2015, just after the boom of the last economic crisis suffered in this century, collected from the \"Sustainability Reports\" of recent years made by the affected Port Authorities. Although the average growth rate in all cases during the mentioned period has been constantly decreasing, approximately 6% in these ports, as revealed in their Annual Reports about the traffic they serve, an exponential growth rate of 2% will be estimated to cover possible punctual peak-consumption. According to these Annual Reports, since 2015, where consumption was 1885 MWh/year in Outer Port of A Coruna, 3259 MWh/year in the Port of Gijon and 5407 MWh/year in the Port of Bilbao, it has been calculated that in 10 years, the final consumption will be 2392 MWh/year, 4134 MWh/year and 6858 MWh/year, respectively. Considering these estimations, the first approach to design the OWC facility is based on an optimal plant that would approximately meet the whole demand. However, due to the dimensions of the modules of the caissons that are necessary to shelter the OWC devices, and the time required to anchor them, none of the lengths for the facility obtained seems reasonable for constructive reasons to satisfy the whole demand. Consequently, the final solution will lie in building plants of approximately 150 m, leading to the construction of three modules for it. In the case of Punta Langosteira, a demand of 85% would be covered, in Norte, it represents a reduction of 42% and in Punta Lucero, it descends to 18%. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & & **Gross Production** & **Net Production** & **Capacity** & **Capacity** \\  & & **per Device** & **per Device** & **Factor (h)** & **Factor (\%)** \\ \hline \multirow{3}{*}{**OWC**} & Punta Langosteira (P2) & 113.959 & 96.865 & 1937.305 & 25.693 \\  & Norte (P3) & 112.874 & 95.943 & 1918.857 & 25.843 \\  & Punta Lucero (P3) & 116.457 & 98.989 & 1979.774 & 26.256 \\ \hline \multirow{3}{*}{**SSG**} & Punta Langosteira (P2) & 334.483 & 248.311 & 1834.263 & 24.327 \\  & Torres (P1) & 130.125 & 110.606 & 713.586 & 9.982 \\ \cline{1-1}  & Punta Lucero (P3) & 215.025 & 182.772 & 1179.172 & 16.060 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Energy production per unit device and factor capacity. In the case of the SSG facility, using modules of 10 m of length and 155 kW, eight modules will be necessary for Punta Langosteira and 38 modules for the rest of the cases. As there is no physical space to install a 380 m plant in the Torres dike and the temporary window for the removal of pieces from the mantle at a length of 380 m in the Punta Lucero dike, it is not viable. It is concluded that the central in all three cases, it is decided to provide a length of 100 m to the wave energy facilities, having 10 modules in each case and covering 110% of the demand in Punta Langosteira (getting self-efficient energetically) and 27% in the other two cases.