The new headquarters of Rhiienergie AG at Kantonsstrasse was built in 2019-2020 in Tamins. It houses offices warehouses, workshops and garages. With its simple, modern lines, the...
HQ Rhiienergie AG
Architect Bruno Krucker
“We should be more radical when it comes to sustainability.“
An interdisciplinary project

The new headquarters of Rhiienergie AG at Kantonsstrasse was built in 2019-2020 in Tamins. It houses offices, warehouses, workshops and garages. Its simple modern lines, the use of wood cladding and integrated PV plans on both roof and facade, allow the building to blend in well with its environment.
The photovoltaic modules are fully integrated into the facade through custom-made photovoltaic modules for creative building integration by Ertex Solartechnik GmbH and also into the roof thanks to Megasol InDach solar tiles and represent Rhiienergie AG’s interest in innovative energy concepts
Thanks to the intensive cooperation between the architects, the client and all the planners and specialists involved, both the preliminary design and the construction project phases were able to meet the required targets in terms of cost, quality, project design and detailing.

Ground floor and first floor.

View of the east facade of the building.

Photovoltaic modules are used as decorative elements.

Building characteristics
  • Building typology
    Industrial / administrative
  • Construction type
  • Year of construction
  • Energy reference surface
    1.612 m²
  • Energy index
    62.4 kWh/m²yr (heating and electricity)
  • Energy labelling
Active solar surface 371m² 96m²
Active solar surface ratio >75% 25-50%
Peak power 66.3 kWp 8.8 kWp
Building skin application Solar tiles Cold facade
Energy production
Source: Solaragentur, Schweizer Solarpreis 2021
Building skin
  • Application
    Solar tiles integrated in a pitched roof
  • Description
    Wooden sloped roof structure on concrete beams with 32 cm insulation
  • U value
    0.16 W/m²K
  • Fastening system
    Modules are laid similarly to conventional roof tiles
  • Other
    The two pitches have an inclination of respectively 30 and 42 degrees towards the south
  • Application
    PV cladding integrated in a cold facade
  • Description
    Wooden frame structure with 24 cm insulation
  • U value
    0.17 W/m²K
  • Fastening system
    Continuous fixing system (vertical wooden battens)
  • Other

Preparation of the facade for the installation of photovoltaic modules.

  • Application
  • Description
    Triple glazing with wood-metal frame
  • U value
    0.75 W/m²K
  • g value

Windows installation.

Aerial view of the new headquarters of Rhiienergie AG.

BIPV module
  • Product
    Roof: Megasol Indach module
    Facade: Custom-made ertex VSG Design modules
  • Manufacturer
    Roof: Megasol Energie AG
    Facade: ertex solartechnik GmbH
  • Cell technology
  • Front glass type/customization
    Screen-printed glass. The back pane is beige, the front side is printed with a distinctive line pattern.
  • Dimensions
    Roof: 221x Megasol Indach modules
    Facade: 22x VSG ESG 5/6 sized 1460x1480mm, 11x VSG ESG 5/6 sized 1480x3000mm
  • Power
    Roof: 300 Wp
    Facade: 424 Wp for the 1480x3000mm modules
  • Specific power
    Facade 95 Wp/m²
  • Weight
    Facade: 128 kg for the 1480x3000mm modules
  • Specific weight
    Facade: 29 kg/m²
Technical details

The building’s load-bearing structure combines simplicity and solidity: the exposed wooden roof structure rests on concrete beams, which in turn are supported by rafters and the staircase walls. The concrete core adds structural stability. If the building were to change use, all the levels of the structure could be reconfigured from scratch without much expense.
The roof and facade are both clad with prefabricated wooden elements. The roof looks like a sawtooth roof, but in reality it is not as such because both sides are closed. The sloping south side is covered with photovoltaic tiles. Between the windows of the south facade, instead of dark wood panels, are used screen-printed photovoltaic modules.
The photovoltaic bands protrude slightly from the facade to face exactly south, while the windows and doors are oriented slightly east, creating a “folded” facade.

Hotspot image
Vertical section
Hotspot image
  • Total cost of the building
    10.2 mio CHF (BKP 1-9)
  • Price per m³  
    840 CHF/m³ (BKP 2)

Exposed wooden supporting structure.

Parties involved
  • Owner
    Rhiienergie AG
  • Architect
    Büro Krucker Architekten AG
  • Site management
    Fanzung AG
  • Photovoltaic Installer – facade
    Meli AG Gebäudehüllen
  • Photovoltaic Installer – roof
    Hassler Energia Alternativa AG
  • Photo
    Georg Aerni
Awards and recognitions
  • Awards
    Swiss Solar Prize Diploma 2021 – Category B: New buildings
  • Publications
    Hochparterre Solaris#5 – Faltwerk und Kraftwerk by Axel Simon – January 2021 (in DE, FR, IT)