Twin City Building Curtain Wall

Twin City Tower

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Energy cost

Reduction in HVAC energy demands

Internal Rate of Return

<8 years 

Onyx Solar supplied amorphous silicon technology for the curtain wall of this iconic project in Bratislava. Amorphous silicon glass supplied is fully black, with a grey frit pattern and argon chamber in various dimensions according to the project requirements. Some of these dimensions almost reaching 4 sqm. The 192 glasses supplied to achieve a Peak Power of 25 kW.


The photovoltaic curtain wall is the perfect solution for new office buildings since it has passive properties include thermal and sound insulation, and also natural light. However, it also offers an active property, the energy it generates. 


Project Twin City is a new development made by one of the largest international developers, HB Reavis. It will become an important icon of  Bratislava.


The strong position of the Group was confirmed in the annual rating carried out by Property EU, placing HB Reavis among the Top 3 office developers across the European Union. The total gross leasable area of  HB Reavis delivered projects add up to 1,064,000 sqm. 



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HB Reavis is an international workspace provider with a mission to create remarkable experiences through real estate solutions. In practice, they invest in, design, build and manage buildings, from bespoke headquarters and retail malls to co-working spaces. But because HB Reavis puts users and local communities at the heart of every decision, these are also inspiring spaces that enhance productivity and wellbeing.


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