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Solar Plants for Zagreb & Zagrebački Holding

Procurement, installation and commissioning of cca 1,2 MW of photovoltaic systems on the roofs of the buildings in Zagreb.

Turnkey Solar Solutions


Zagrebački Holding (Grad Zagreb)

Zagrebački Holding provides utility, commercial, energy, public supply & drainage, and pharmacy services in the City of Zagreb.

Furthermore, Zagrebački Holding provides Coach Terminal services, parking services in public areas and public garages, distribution of telecommunication sewerage, and other communal infrastructure like maintaining public passages, fountains, public toilets, and also maintains Zagreb's famous „Grički top“.

In the public water supply and drainage sector, they provide collection, purification, and distribution services and maintain water networks. Energy activities, gas distribution, and renewable energy production are also part of their services. Additionally, they supply medical products, and health protection items, operating a galenical and analytical laboratory.

Zagrebački Holding was founded in 2007 and is 100% owned by the city of Zagreb.


Solar Plant Installation for Eight Locations

Project included engineering, procurement, installations and commissioning of 8 different solar power plants as follow:

Klinika za psihijatriju ”Sveti Ivan”

  • Location: Jankomir 11,
  • Installed Power: 322,2 kWp (300 kW)

Take a look at the installed 716 photovoltaic modules at the Sveti Ivan Psychiatry Clinic.

Dječji vrtić Trnsko- podružnica Kajzerica

  • Location: Ulica Žarka Dolinara 11
  • Installed Power: 108,0 kWp (100 kW)

Swimming pool Utrine

  • Location: Kombolova ulica 4a
  • Installed Power: 296,1 kWp (270 kW)

SOC Jakuševec

  • Location: Tišinska ulica 71
  • Installed Power: 54 kWp (50 kW)

Swimming pool Jelkovec

  • Location: Vladimira Stahuljaka 1a
  • Installed Power: 108,0 kWp (100 kW)

 Swimming pool Svetice

  • Location : Ulica Divka Budaka 21
  • Installed Power: 322,2 kWp (300 kW)

 Nursing home Trešnjevka- podružnica I

  • Location: Drenovačka ulica 30
  • Installed Power: 108,0 kWp (100 kW)

Nursing home Trešnjevka- podružnica II

  • Location: Trg Slavoljuba Penkale 1
  • Installed Power 108,0 kWp (100 kW)


Turnkey Solar Solution

This case study provides a comprehensive overview of a completed solar solution project. It outlines the key stages and steps involved, including site assessment, procurement, installation, testing, and commissioning.

The study also highlights the selection of high-quality components and the implementation of advanced technology to optimize performance and long-term maintenance. Furthermore, it discloses the establishment of a monitoring system and the provision of training sessions to ensure the effective operation and maintenance of the solar plants.

The purpose is to document the successful implementation of a solar solution project, focusing on the various stages and steps involved. The project aimed to evaluate the feasibility of solar installations at multiple locations, source high-quality components, install the solar panels, conduct testing and commissioning, and establish a monitoring system for effective performance tracking.

Stage 1 - Site Assessment

In this initial stage, thorough site assessments were conducted at each location to determine the feasibility of solar installations. These assessments involved evaluating structural factors, positioning, and available space.

The findings from the site assessments served as the basis for subsequent project planning and design.

Stage 2 - Procurement

Once the site assessments were completed and we have been provided with detailed engineering designs, the project moved into the procurement phase. The procurement team, tasked with sourcing the highest-quality components, carefully selected GoodWe as the preferred provider of inverters. GoodWe is recognized as one of the world's leading solar solutions providers.

By partnering with GoodWe as an official distributor, the project ensured the use of reliable and efficient inverters. Furthermore, solar panels with patented technology, requiring less cleaning and enabling long-lasting performance, were selected to minimize future maintenance costs.

Stage 3 - Installation

With the procurement phase completed, the experienced installation team commenced the installation process at each location. Emphasizing safety and adhering to industry best practices, the team meticulously installed the solar panels.

Furthermore, they ensured proper integration with the grid and complied with all electrical standards to guarantee a reliable and efficient energy transfer. The acquisition of permits and approvals involved close coordination with local authorities.

Stage 4 - Testing and Commissioning

Upon the completion of the installation, the project entered the testing and commissioning phase. Thorough testing and commissioning procedures were conducted to verify the optimal functioning and performance of the solar plants. This involved assessing the connectivity, efficiency, and reliability of the systems.

Any identified concerns were promptly addressed to ensure the achievement of optimal performance levels.

Stage 5 - Monitoring and Maintenance

To enable effective performance tracking, a monitoring system was implemented for each solar plant. This system allowed for the continuous monitoring of energy generation and performance. Additionally, comprehensive training sessions were conducted to empower staff members to operate and maintain the solar plants effectively. By combining monitoring capabilities and well-trained staff, the project aimed to maximize the long-term efficiency and productivity of the solar plants.

This case study has presented a detailed overview of the successful implementation of a solar solution project. By following a structured approach encompassing site assessment, procurement, installation, testing, and commissioning, the project achieved its objectives of providing reliable and efficient solar energy generation.

The selection of high-quality components, such as GoodWe inverters, and the utilization of advanced technology contributed to long-lasting performance and reduced maintenance costs. The implementation of a monitoring system and comprehensive training further ensured the effective operation and maintenance of the solar plants.

Duplico Services

Throughout our presence on the market of the Republic of Croatia, European Union & beyond, we have profiled ourselves as a leading expert within many industries. Here is how we can help You.


  • I would accentuate Duplico as a very positive example of innovation and the application of the latest technologies and trends, such as "state-of-the-art" remote control systems. We are proud of the numerous applications of Siemens systems and solutions in water management, industry, and energy projects. In current Croatian surroundings, I also perceive Duplico to be an inspiring "role model" of successful digital transformation of its own business processes.

    Ivana Ilic Head of Digital Industries at Siemens Croatia
  • The peculiarity and the key to the long-term success of the Duplico company lies in the exceptional agility and commitment of the Duplico team in providing the best service to clients, openness to adopting new knowledge and innovative technologies, and a high level of expertise and cooperation.

    Arthur Vasarevic Country General Manager (CRO/SLO/BIH)
  • I started working with Duplico more than 10 years ago. I would especially emphasize their focus on client satisfaction, flexibility in finding technical and administrative solutions, and adaptation to changes within the projects we have collaborated on.

    Tomislav Durokovic Senior director, Teva global engineering
  • Duplico is a truly quality partner that we plan to rely on in future business challenges. The professional attitude towards the client, which is unquestionable from the contracting process, the execution of works, to the commissioning of the equipment or plant, places Duplico among our privileged partners in the domain of electrical works

    Dinko Condic Chief Executive Officer
  • Cooperation with Duplico is straightforward and high-quality because their experts know and understand the plant operation technology, and their knowledge is broader than just the knowledge of software development.

    Igor Herman Chief Executive Officer (Weishaupt d.o.o. - Celje)
  • We are happy to work with Duplico as one of our main partners in the region. In this ascending roadmap, we are careful to select key partners who can support and carry the GoodWe brand, technology, and know-how in the highest of standards.

    Thanasis Sakkas Sales Director Channels Europe & NA region at GoodWe
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