On Tuesday, 17 October 2023, at the City Hall, we and our partners signed a contract for the project titled Green energy on the surfaces and facilities of the City of Ljubljana, within the framework of which we will set up solar power plants on the facilities in the ownership of the City of Ljubljana.
The public-private partnership between the City of Ljubljana and the companies RESALTA d.o.o., RES ERP d.o.o. and Energetika Ljubljana represents an extraordinary step forward in our efforts towards a sustainable future for our city.
The basic idea of the project is comprised of the installation of solar power plants on public buildings, followed by a comprehensive service provided by the private partner to the City of Ljubljana and its public institutions: supply with green energy produced on public buildings, management, regular and investment maintenance of the devices and the supply of electricity shortages.
We will install 51 solar power plants on the roofs of public buildings, including primary schools, kindergartens, health care centres and sports and cultural facilities, with a total capacity of almost 5 MWp, and the guaranteed annual production will exceed 5,200 MWh.The value of the project is approximately 5 million euros. The duration of the concession contract is 17 years, and then the ownership of the solar power plants transfers to the City of Ljubljana. The project''s added value is the monthly billing of electricity, the so-called »net billing«, which will enable the City of Ljubljana to use the excess solar energy produced within the billing month when there is an energy shortage.
Community self-sufficiency
47 of the 51 solar power plants will be all connected into one large community that combines public buildings. This approach enables efficient use of energy resources and makes the project more sustainable. Together with monthly billing, this minimizes the possibility of a negative electricity price for the City of Ljubljana. This community will also be the largest in Slovenia to date.
Special method for subsidies
Using competitive dialogue, we designed a method that benefits the public partner in the case of obtaining subsidies (lowering the price of the service for the public partner). This method is an excellent way to adapt the project to changes concerning the various subsidies that have not yet been determined, while at the same time avoiding the risk of increasing the investment value that occurs when tendering for grants.
Price of electricity for shortages
The price of electricity for shortages, that is, for electricity that is not produced from installed solar power plants, was tied to the price of the supplier selected each time, in line with legal provisions. This ensures additional transparency and price stability in the project.
Transfer of risks to the private partner
Transferring most of the risks to a private partner means that this partner is responsible for managing various uncertainties, which increases the reliability of the project for the City of Ljubljana, where most of the uncertainties are related to the technical maintenance of power plants and the supply and sale of electricity (e.g., a negative price of electricity, building consumption profile, etc.).
Management and maintenance
The duty of the private partner to manage and maintain the solar power plants means that it is responsible for the uninterrupted operation of the devices during the entire concession period.
With this project, we will contribute to reducing greenhouse gas emissions and ensure a sustainable and clean future for our city. In total, we will save over 2,500 tons of CO2 equivalent during the duration of the project, which is an amount refined by about 95,000 average-sized trees. A public-private partnership is an excellent example of cooperation between sectors that combine their strengths and resources for the common good. This project is an important milestone on the way to a more sustainable, responsible and green city.
Note: The Northern Temperate Zone extends from 35° latitude North up to 66.5° latitude.
So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 40 locations across Slovenia. This analysis provides insights into each city/location''s potential for harnessing solar energy through PV installations.
Link: Solar PV potential in Slovenia by location
Seasonal solar PV output for Latitude: 46.0503, Longitude: 14.5046 (Ljubljana, Slovenia), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:
To maximize your solar PV system''s energy output in Ljubljana, Slovenia (Lat/Long 46.0503, 14.5046) throughout the year, you should tilt your panels at an angle of 39° South for fixed panel installations.
As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.
We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.
If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Ljubljana, Slovenia. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 39° South tilt angle throughout the year.
Our recommendations take into account more than just latitude and Earth''s position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA''s Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.
This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.
We''ve added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Ljubljana, Slovenia.
This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.
The topography around Ljubljana, Slovenia is relatively flat and hilly. The highest point in the area is Mt. Triglav at an elevation of 2,864 meters above sea level. Areas with good solar access and a lack of trees and tall buildings would be most suited for large-scale solar PV installations. Flat areas with unobstructed south-facing slopes are ideal for this purpose as they can capture the most sunlight throughout the day. Areas near Šmartno, Ig, Dobrova, Dol pri Ljubljani, Brezovica pri Ljubljani, and Višnja Gora would be well-suited for large-scale solar PV installations due to their close proximity to Ljubljana and their generally flat terrain with few obstructions.
Slovenia ranks 60th in the world for cumulative solar PV capacity, with 367 total MW''s of solar PV installed. Each year Slovenia is generating 175 Watts from solar PV per capita (Slovenia ranks 28th in the world for solar PV Watts generated per capita). [source]
Yes, there are incentives for businesses wanting to install solar energy in Slovenia. The Slovenian government offers a range of financial incentives and subsidies for businesses that install solar energy systems. These include grants, tax credits, and other forms of support. Additionally, the government has set up a number of programs to promote the use of renewable energy sources such as solar power.
Do you have more up to date information than this on incentives towards solar PV projects in Slovenia? Please reach out to us and help us keep this information current. Thanks!
The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.
However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.
Enhance your solar panel''s performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.
Slovenia’s capital city established a public-private partnership for the construction of 51 photovoltaic units on public buildings
About Solar energy ljubljana
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