# Energy Transition on Sifnos: An Approach to Economic and Social Transition and Development
## 4 Results
### Planning and Sizing Results
The installation position combines a cluster of favorable features which make it ideal for the specific project, such as:  
* the availability of a relatively flat area at the upper reservoir's installation location minimizes the required excavation works for the configuration of the upper reservoir's basin
* the mild slopes of the wind park's installation hill, without any abrupt changes in the land morphology, favor smooth wind flow, without atmospheric boundary layer detachment and shear effect (Figure 9)
* the wind park's installation position is free of physical or technical obstacles towards the sea, thus allowing unobstructed wind flow from the prevailing blowing direction (northeast) towards the turbines' rotors, without any deterioration of its kinetic energy
* the mild slopes of the penstock installation land provide easy and secure access for the pipelines' installation on the surface, avoiding the need for the construction of expensive underground tunnels
* the relatively flat area along the coastline enables its configuration for the erection of the hydroelectric power plant and the pump station without excessive land works
* the installation site is located far enough from all settlements on Sifnos and outside of any site of cultural and historical interest, as well as the Natura 2000 region found in the central and western part of the island, facilitating, in this way, the licensing process and ensuring widespread acceptance from the local community and any environmental organizations. Figure 9: Siting of the wind park over a 3D annual average wind velocity background. The installation position was selected by the scientific team together with the founding members of the SIC. The aforementioned positive features reveal the potential when the technical expertise of experienced consultants is combined with the deep knowledge of the available territory, supplied by the local citizens, and their interest in achieving the optimum possible results of their initiative. The results regarding the annual electricity production and storage, presented in Table 3, were calculated by integrating the corresponding annual power production or storage time series. As seen in this table, the fundamental objective of the hybrid power plant, namely the 100% coverage of the electricity demand in real time and on an annual basis, is achieved with the proposed sizing and synthesis. However, the wind park's high electricity production surplus, calculated at 23,311 MWh (51.8% of its initial electricity production), is also observed in this table. This annual electricity surplus is the result of wind power production which can neither penetrate for direct power demand coverage, due to the maximum instant penetration percentage limit, nor be stored in the PHS system because of the fully charged upper reservoir. This electricity surplus at a first glance features as a drawback due to the hybrid power plant's oversizing, meaning that it can cope with the increasing power demand during summer. However, given the purpose and the objectives of the SEC, this additional electricity can be turned into a lever for the development of new, developmental activities on the island, thoroughly analyzed in the next section. The annual power production synthesis graph is given in Figure 10a, while in Figure 10b, a power production synthesis graph is presented focused on a 10-day time interval during the peak demand period. In Figure 11, the annual fluctuation of the water volume stored in the upper reservoir is depicted. The upper reservoir is full for most of the time from October to May. In summer, due to the increasing power demand, the water volume in the reservoir gradually decreases. The reservoir is never empty, and hence there is always enough water in the reservoir to address the power demand and achieve 100% annual electricity demand coverage.