21.01.2021 | Solar power from the Muttenalp

Pioneer project above the fog line

Axpo and IWB are building the largest alpine solar plant at 2.500 metres above sea level on the Muttsee dam. Denner will buy the alpine energy for 20 years. With the 2.2-megawatt pioneering project, Axpo and IWB are driving forward the expansion of renewable energies in Switzerland and supplying important winter electricity.

A solar plant with almost 5,000 photovoltaic modules will be installed on the dam in the Glarus Alps. The plant will produce approx. 3.3 gigawatt-hours of electricity per year – corresponding to the consumption of 740 four-person households. The solar plant will cover a surface of 10,000 square metres, which corresponds to the area of 1.5 football fields. The dam is part of the pumped storage plant Limmern in the Glarus Alps and is the highest situated dam in Europe.

Contribution to winter power

The alpine location makes the solar plant particularly efficient. It will generate half of its production during the winter half-year because of its location above the fog line and the high sun exposure. In addi-tion, solar plants like the cold. The efficiency of PV modules is higher at low temperatures. The high alti-tude is also favourable for the so-called "Albedo effect": Sunlight is reflected by the snow cover and results in higher solar power production.

Optimally situated

The southeast/southwest position is also advantageous for the construction of a solar plant on the Muttsee dam, allowing optimal use of sunlight. A further advantage: Thanks to the existing infrastructure belonging to the Limmern pumped storage plant, additional grid expansion is unnecessary and no additional open space will be needed for construction.

Pioneer project key figures
  • Largest alpine solar plant in Switzerland and Europe
  •  Solar power at 2,500 metres above sea level
  •  Installed capacity of 2,2 megawatts
  •  Annual production of 3.3  gigawatt-hours
  •  4'872 solar modules
  • Solar plant with a surface of 10,000 square metres.

More articles for you

Show all

The role of gas as the world moves towards a low carbon economy

Market insights: a fuel that fills the gap between fossil and renewables energies

Read more

Renewable energy

Battery costs to be halved by 2050

Large comparative study by the University of Münster

Read more

Innovation

Exploring the eternal city just got more eco-friendly

Axpo Italia launches charging stations for e-cars in Rome

Read more

People

“The world of energy really fascinates me”

Trainee at Axpo: Annina Mehlisch

Read more

By clicking the "Accept Cookies" button, you agree to the storage of cookies on your device in order to improve navigation through this website, to analyze your use of this website, as well as to assist us in our marketing activities that may be carried out. We inform you that cookies that are not necessary are disabled by default. For more information, please refer to the Privacy Policy.