The Barth V Solar Park built without subsidies
With our 175 MWp Don Rodrigo project in Seville in southern Spain, we showed in 2018 that large solar power plants could be realised in Europe without any subsidies and with lower electricity generation costs than any other form of energy. But is this also possible with an 8.8 MWp solar park in Germany? Yes, if there is smart planning from the very beginning ...
Barth V – already planned for tomorrow in 2016
During the construction of the Barth III Solar Park in 2016, on the premises of the Stralsund-Barth Airport by the Baltic Sea, we already had in mind the Barth IV to VI solar parks that were scheduled for 2019 – and had planned accordingly. So we laid the cables for the new parks right away in the trenches of Barth III, for example, and apportioned the costs accordingly. We planned the facilities with our proven cost-efficient system design and concluded joint funding for all three new parks by a long-term non-recourse financing contract with a 20-year loan purchase period by the German Umweltbank, so we could keep the interest rates as low as possible. Barth V is one of the three new solar parks on the Barth Airport and is our first realised subsidy-free solar project in Germany and at the same time the largest of its kind in this country. The electricity is marketed through a five-year power purchase agreement with BayWa r.e. Clean Energy Sourcing GmbH (CLENS), the in-house energy trading subsidiary. Barth V is commissioned since October 2019.
So our message is that solar energy is commercially viable and is the most important source of energy for our future.
Despite the realization of the first subsidy-free solar project in Germany, the EEG will continue to play a central role in the success of the energy transition in the coming years. Although the implementation of self-consumption concepts without a feed-in tariff is possible in the areas of residential and medium-sized commercial installations, support will remain necessary in this segment. In addition, the promotion of small installations is desirable and sensible for reasons of the participation of broad sections of the population and the facilitation of decentralized, load-related supply.
Barth V has an overall capacity of 8.8 MWp and an annual yield of 9,086 MWh. That is equivalent to the average consumption of 2,884 German households. Furthermore, 6,188 tonnes of CO2 emissions can be eliminated through Barth V. A total of 23,728 modules, each with 370 Wp, will be used for Barth V.
Barth V was built in Mecklenburg-West Pomerania, on the premises of the Stralsund-Barth Airport by the Baltic Sea. (Site plan/Topography)
Leasing the land
The lessor of the land is the Stralsund-Barth Airport, with whom we have cultivated very good relations since the construction of the first solar park there in 2012. As Stefan Kerth, the mayor of Barth, pointed out at the opening ceremony for the Barth III solar park in May 2017, by collaborating with us, the Stralsund-Barth Airport has become one of the few municipal airports that can be run without any losses.
Environmental compensation measures
In accordance with § 9 par. 1 no. 25a of the German Federal Building Code (BauGB), trees and bushes will be planted round the solar park. Additionally, a double-row field hedge will be planted with the following composition:
- 20 % common hornbeam (Carpinus betulus)
- 30% hawthorn (Crataegus monogyna)
- 30 % sloe (Prunus spinosa)
- 10% elder (Sambucus nigra)
- 5% rose briar (Rosa canina)
- 5% hazel (Corylus avellana)
This compensation for encroachments into the environment and countryside, as set out in § 1a par. 3 of the BauGB, covering 19.37 hectares of equivalent compensation area, will be managed through the development of natural woodland areas on the sub-plots 97/2 and 98 of plot 1 in the Planitz district through natural succession and/or forgoing any forestry use. The remaining compensation deficit is made up for through ecopoints that we purchase from the municipal nature conservation authority.
Involvement of local partners
As with all of our projects, we rely on local partners in the construction of our solar parks. For clearing away unexploded ordnance, we used the company M.A.K.S. Kampfmittelbergung GmbH from Peenemünde.
The pooling station was constructed by the company Beton- und Energietechnik Heinrich Gräper GmbH & Co. KG located in Ahlhorn and Heiligengabe.
The measurement system used comes from the company Acteno located in Heidelberg. For the measurement devices required for this, we rely on the smart meters from the company EMH located in Gallin.
Details of the system design
The solar plant was equipped with modules from Risen Solar Technology. These are 72-cell high-performance monocrystalline PERC modules.
Altogether 23,728 modules of 370 Wp were fitted to generate 8,779.36 kWp.
We use string inverters from the Huawei company, type SUN2000 60KTL (6 units) and 100KTL (37 units).
We use a high-quality supporting structure from Zimmermann PV Stahlbau GmbH & Co. consisting of galvanised steel construction elements. These are highly resistant to corrosion and exceptionally stable.
For 24/7 remote monitoring, we use a system from ZEBOTEC GmbH with individual access and various data analysis tools, with primary control from our headquarters in Munich and first-level support at the park location.
Through the monitoring system, it is also possible to control the production of the plant to meet the local requirements in accordance with the wishes of the network provider.
- Medium-voltage transformer from Siemens
- Oil transformer with 1250 to 1800 kVA
- Production and testing to meet the IEC 60076 standard
- 24-month guarantee after on-site check
- Transformer stations by FEAG GmbH
- Rated Power: 1250 to 1800 kVA
- Primary level voltage: 20 kV
- Secondary nominal voltage: 0.8 kV
- Warranty: 30 months
Measurement system and pooling station
In order for all three new solar parks to be used within the existing integrated cable system ducts, each park has to have its own meters installed so the generated power can be measured and invoiced separately. The power is conducted to the Kenz substation through a pooling station with a weight of around 35 tonnes. A fourth meter is located there that measures the total output.
|Duration of construction phase||3 months|
Hammer stroke instead of groundbreaking ceremony
On Wednesday, 5th June, we celebrated a hammer stroke event for the three new solar parks Barth IV-VI with a total capacity of 18.7 MWp at Ostseeflughafen Stralsund-Barth. After an introduction and presentation of the new parks by Albert Schlaak, our project manager responsible for the parks, a symbolic hammer stroke was the highlight of the celebration. When the predecessor solar park Barth III was built in 2016, the cables for the new parks, including Barth V as the first non-subsidized solar park in Germany, were laid. As a result, the construction of the substructure for all three new solar parks can now begin directly.