Hybrid power plant in Sifnos

1. Licensing procedure

 

Application number in Regulatory Authority of Energy for the issuance of the Power Production license

Γ-06050

 

 

2. Technology

 

R.E.S. unit:

wind park

Storage unit

pumped hydro storage (PHS)

 

 

Figure 1: Layout of the hybrid power plant of 8ΜW guaranteed power in Sifnos.

 

 

3. Target

 

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.

 

Figure 2: 3D representation of the wind parks siting on a 3D wind potential map background.

 

Figure 3: 3D representation of the pumped storage plant upper reservoir.

 

 

4. Dimensioning

 

Nominal guaranteed power (MW)

8.0

Wind park’s nominal power (MW)

11.5

Hydro turbines nominal power (MW)

8.74

Pumps nominal mechanical power (MW)

10.28

Pumps nominal electrical power (MW)

10.83

Hydro turbines nominal flow (m3/s)

2.42

Pumps nominal flow (m3/s)

2.40

Penstock structure

double penstock

Minimum falling head (m)

300.5

Maximum pumping head (m)

337.5

Falling penstock inner diameter (m)

2 x 1.0

Pumping penstock inner diameter (m)

2 x 1.0

Upper reservoir total volume (m3)

1,106,057

Upper reservoir effective capacity (m3)

1,063,878

Minimum water volume stored in upper reservoir (m3)

42,178

Total penstock length (m)

1,183

Lower reservoir

sea

 

 

Figure 4: Penstock route representation on a 3D digitized land terrain.

 

 

Figure 5: Vertical cross section of the penstock route.

 

 

5. Energy – environmental results

 

Annual cover percentage of the electricity consumption in the autonomous insular system from the hybrid power plant:

100%

CO2 emission annual reduction (tn):

11.444,48 (100%)

Annual averaged efficiency of the pumped storage

64%

Wind park production surplus

30%

 

 

Figure 6: Power production synthesis during the annual peak power demand period (August) before the introduction of the hybrid power plant.

 

 

Figure 7: Power production synthesis during the annual peak power demand period (August) after the introduction of the hybrid power plant.

 

Figure 8: Annual power production synthesis after the introduction of the hybrid power plant.