Solar power and energy efficiency:
we provide a wide range of expertise at the cutting edge of technology


Photovoltaic plants


We advise authorities, firms and power supply companies on the development and realization of photovoltaic power systems and on improving energy efficiency.

  • Photovoltaic potential estimation
  • Feasibility study
  • Financier opportunities (possibilities with Zürichsee Solarstrom AG)
  • Possible subsidies
  • Analysis of own-consumption
  • Coordination of electricity production and consumers (TNCALL)


We plan medium-sized and large photovoltaic systems on existing used areas such as roofs, noise barriers alongside highways and railroads, or wherever spaces are conducive for solar power and it makes sense ecologically and economically.

  • Project designing
  • Detailed planning
  • Announcement
  • Offer analysis
  • Submission
  • Contracts


We realize your photovoltaic system and are also available to you competently in operation:

  • Site management
  • Execution supervision
  • Quality assurance
  • Acceptance and control measurements
  • Monitoring with remote monitoring
  • Control bills electricity production

Photovoltaic projects

2 PV plants Langnau a.A.

125 kWp

PV plants horgen

7 PV plants, 224 kWp

VBZ Tramdepot Irchel

200 kWp

Barn roof Uetikon a.S.

78 kWp

PV plants at school Erlenbach

3 roof top plants and 1 facade, 195 kWp

AMAG Buchs, Zurich

190 kWp

Swissmill Zurich

120 kWp

Swissmill Basel

50 kWp

Low-energy-house Erlenbach

thermal solar 22% heat/59% warm water, PV plant 2 kWp

Freilager Zurich

270 kWp for the ewz stock exchange

PV plant Magadino

100 kWp along the railway Bellinzona-Locarno. The elevation of the modules also serves as a supporting structure for a remote steam line, but not as sound insulation.

Building integration

Roofs and facades are ideal carriers for photovoltaic power plants.


Cantonal school Stadelhofen
Swissmill Zurich
GISS Gebäude-Integrierte Solarstrom-Systeme

PV noise barriers

Noise barriers along roads and rails provide ideal surfaces for photovoltaic systems without consuming additional land. Thanks to the bifacial technology, almost all road suitable for PV.

In many sound barriers photovoltaic can be retrofitted. Economically, it makes sense to include photovoltaics directly in the planning of new sound barrier systems or renovations

The photovoltaic modules can be integrated directly into the noise barrier and at the same time can also take over the sound insulation function. Partially transparent PV sound barriers are also possible today.

With the world’s first PV noise barrier on the A13 near Chur in 1989, TNC has a wealth of experience and has since designed and implemented several PV noise barriers.



PV Schallschutzanlage, Forchstrasse Zumikon, ca. 80 kWp.


Weltweit erste PV Schallschutzanlage entlang der Bahn in Wallisellen, Zürich, 10 kWp, Schweizer Solarpreis 1999
Flyer PV Schallschutz Wallisellen (PDF)


Die zweite PV Schallschutzanlage entlang der A2 bei Giebenach, 100 kW


weltweit erste PV Schallschutzanlage 100 kWp, A13 Domat/Ems bei Chur

Bifacial PV

Bifacial cells are on both sides photosensitive solar cells, which are placed vertically in the north-south direction. Based on a module that has the same efficiency on both sides, a bifacial module achieves an annual yield of almost 100% of a standard module with optimum alignment.

Bifacial for PV noise barrier

Bifacial technology is particularly suitable for use in sound barrier systems with reflective sound insulation. The fact that no bevelled parts are necessary, there are no conflicts with traffic, the statistic is easier and the space required less.

As TNC calculated in the European PV Power Potential Study, the potential for using bifacial technology in Western Europe is around 1200 MW.



weltweit erste bifacial Schallschutzanlage bei Wallisellen/Zürich, 10 kWp Pilotanlage.


Weltweit erste Bifacial Schallschutzanlage Bahnhofbereich Münsingen inkl. Messkampagne

PV operation

We offer technical and commercial management for larger PV plants and PV investment organizations.

Plant monitoring and yield control

  • Establishment of monitoring
  • Control of yields
  • Control of the yield guarantees according to the contract of employment
  • Comparison of the settlements to the compensation
  • Accompaniment authorized maintenance company

Debt collection and refinancing

  • Control compensation and monitoring of tariffs
  • Quarterly compilation and preparation of billing for the ecological added value and further financing
  • Control of correspondence with electricity customers
  • Control billing process PV self-consumption
  • Possible optimization on demand

Operating fault

  • Professional initial evaluation
  • Commissioning of the repairing
  • If necessary, solicitation of offers and application
  • Enforcement and control of work
  • Settlement with the insurance


HydroSun promotes the fast development of renewable electricity production and combines hydropower and floating photovoltaic systems to actual hybrid power plants. We focus an clean and sustainable energy production. The synergy potential of the energy sources sun and water will be fully exploited. HydroSun will significantly increase or even double the capacity of hydropower plants. The idea of combining floating photovoltaic and hydropower for electricity production was patented by TNC in 2009.


By combining PV with hydropower, HydroSun can deliver balanced power throughout the year. On fine days, the capacity of the hydroelectric power plant can be more than doubled. the solar-generated electricity yield reduces the water consumption of the hydroelectric power plant, so that dammed water volumes are available for low-sun days and nights.


Hydroelectric power plants have already been developed for transport purposes and have electrical and technical infrastructures to feed solar power in the grid. The power production of the depreciated hydropower can be sustainably increased, without increasing the dam walls. Due to the underwater arrangement of the floats and the open over-construction, a large-area cover of the lake surface will be let.


HydroSun is not about floating PV systems on public lakes but on already artificial reservoirs. But even here the potential is huge. A first potential estimate for Switzerland shows a technical potential of 2.5 GW of power and an annual yield of 2.6 TWh, without additional land use, through innovation!

Aerial images

Luftaufnahmen an der Forchstrasse in Zumikon ZH Foto Emanuel Ammon for TNC

Luftaufnahmen an der Forchstrasse in Zumikon ZH Foto Emanuel Ammon for TNC

Luftaufnahmen VBZ Tramdepot Irchel Foto Emanuel Ammon for TNC

Luftaufnahmen VBZ Tramdepot Irchel Foto Emanuel Ammon for TNC