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Dor Marian, Wiren: Cluj-Napoca can cover 50% of its energy needs from own production by investing in small PV rooftop systems

28 May 2021

The city of Cluj-Napoca can generate 50% of the energy needs through the installation of photovoltaic systems on the roofs, said Dor Marian, CEO Wiren, at the conference “Digitalization and Energy Efficiency – Cluj- Napoca”, organized by Energynomics. Wiren promotes renewable energy production, with a focus on energy-efficient systems and optimal energy production.

“Within Wiren, we want to actively contribute to creating a better community that can realize the potential of green energy and utilize the most cost-effective energy systems. We address both individuals, legal persons or authorities. We build photovoltaic parks of various sizes – from tens and hundreds of MW to rooftop systems,” said Dor Marian.

“We noticed that the market is really starting to make sense, as no subsidies are needed. Looking at the costs of solar investment, they dropped significantly to 25% of what it was 8 years ago.” Such systems are depreciated over 6-7 years.

“We also noticed from official data that the city of Cluj-Napoca has an annual consumption of 457 GWh, of which 55% in the residential sector. Industrial parks consume 13%, retail area, 10%, public administration, 9% and other sectors, around 11%. For each sector, we have carried out analyzes to see where new PV systems should be built. A first sector was the residential sector,” he added.

By analyzing official data, the residential sector has an annual consumption of 253 GWh. “From this number, 40% of residential consumers would be eligible. This will require the installation of 9.266 PV systems with an average power of 10kWp. Implementing such a project takes about 7-9 years, but in the end, it will mean a 23% green energy input into the energy consumed in Cluj-Napoca”.

Industrial parks have an annual consumption of 60,4 GWh. Industrial parks can enjoy 100% eligibility by installing 163 PV systems with an average power of 336.8 kVp. The total capacity installed in the industrial sector will amount to 54.9 MWp. The major advantage of industrial parks is that 99% of the solar electricity produced is used for own needs.

Public buildings occupy 3rd place among the electricity consumers in Cluj-Napoca, with annual consumption of around 42 GWh. By installing around 385 photovoltaic systems, totaling 11.6 MW of production capacity with an average capacity of 30kWp, the percentage of electricity cover amounts to 70% of the total consumption of this sector.


The share of green energy that public spaces will have in total electricity consumption can be 6%.

Finally, the retail sector has an annual consumption of around 50 GWh. “Based on these data, 50% of these consumers were eligible. Thus, by installing 764 PV systems with an average power of 30kWp, the sector’s consumption can be “greened” by about 50%. Also, the implementation of such a project takes about 3-5 years and can amount to approximately 3% green energy input from the energy consumed in Cluj-Napoca”.

 width=The other major electricity consumers in Cluj-Napoca include hospitals, educational establishments, cultural institutions and the HoReCa sector. A total of 526 PV installations with an average output of 30-50 kWp are sufficient to cover an eligibility percentage of 50% of all the sectors mentioned. “We estimate that this project can be brought to maturity in about 9 years, which in total generate about 50% of the energy consumed by the city of Cluj-Napoca in one year,” he concluded.

Therefore, starting from a total consumption of 457 GWh, Cluj-Napoca can
ensure 50% of its energy from its own production by installing 11,035
photovoltaic systems, totaling a renewable energy production
of approximately 227 GWh.

The conference “Digitalization and Energy Efficiency – Cluj-Napoca” was organized by Energynomics, with the support of our partners ABB, Cargus, Claritech, CREESC, Eaton, Enel X Romania, EnergoBit, Kawasaki Gas Turbines Europe, Photomate, Renovatio, Sensible, Wiren.

More than 220 people registered on the MyConnector platform to participate in the dialogue.

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