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1. Licensing procedure |
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Application number in Regulatory Authority of Energy for the issuance of the Power Production license |
Γ-06050 |
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2. Technology |
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R.E.S. unit: |
wind park |
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Storage unit |
pumped hydro storage (PHS) |
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Figure 1: Layout of the hybrid power plant of 8ΜW guaranteed power in Sifnos. |
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3. Target |
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The hybrid power plant in Sifnos aims at the 100% cover of the annual electricity production in the island. This is achieved with the direct wind park penetration to the power demand up to a percentage of 15% and with the complementary production of the hydro turbines. The installation of a double penstock enables the simultaneous electricity production and storage from the pumped hydro storage plant. |
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Figure 2: 3D representation of the wind park’s siting on a 3D wind potential map background. |
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Figure 3: 3D representation of the pumped storage plant upper reservoir. |
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4. Dimensioning |
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Nominal guaranteed power (MW) |
8.0 |
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Wind park’s nominal power (MW) |
11.5 |
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Hydro turbines nominal power (MW) |
8.74 |
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Pumps nominal mechanical power (MW) |
10.28 |
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Pumps nominal electrical power (MW) |
10.83 |
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Hydro turbines nominal flow (m3/s) |
2.42 |
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Pumps nominal flow (m3/s) |
2.40 |
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Penstock structure |
double penstock |
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Minimum falling head (m) |
300.5 |
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Maximum pumping head (m) |
337.5 |
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Falling penstock inner diameter (m) |
2 x 1.0 |
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Pumping penstock inner diameter (m) |
2 x 1.0 |
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Upper reservoir total volume (m3) |
1,106,057 |
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Upper reservoir effective capacity (m3) |
1,063,878 |
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Minimum water volume stored in upper reservoir (m3) |
42,178 |
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Total penstock length (m) |
1,183 |
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Lower reservoir |
sea |
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Figure 4: Penstock route representation on a 3D digitized land terrain. |
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Figure 5: Vertical cross section of the penstock route. |
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5. Energy – environmental results |
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Annual cover percentage of the electricity consumption in the autonomous insular system from the hybrid power plant: |
100% |
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CO2 emission annual reduction (tn): |
11.444,48 (100%) |
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Annual averaged efficiency of the pumped storage |
64% |
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Wind park production surplus |
30% |
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Figure 6: Power production synthesis during the annual peak power demand period (August) before the introduction of the hybrid power plant. |
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Figure 7: Power production synthesis during the annual peak power demand period (August) after the introduction of the hybrid power plant. |
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Figure 8: Annual power production synthesis after the introduction of the hybrid power plant. |
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