Langenargen goes green: New solar energy saves money and CO2!

Langenargen goes green: New solar energy saves money and CO2!

Cologne is becoming increasingly green and relies on sustainable energy production. A remarkable example is provided by the municipality of Langenargen, which is profitably leveraging its structure in areas where clean energy is at stake. A new photovoltaic system has been in operation on the roof of the lido since the end of July 2025, with 172 modules achieving an output of 78.26 kWp. This means that around 64,600 kilowatt hours of electricity can be produced annually, which corresponds to the needs of around 19 three-person households. The energy generated is mainly used for the lido's own consumption, particularly for the pump technology in the pools and the instantaneous water heaters for the showers. Excess electricity goes into the public grid, where it is paid for. The self-consumption rate is an impressive 83 percent, which means a reduction in grid electricity consumption of 53,990 kilowatt hours and annual savings of around 14,198 euros. Not to forget: This project will reduce CO2 emissions by around 28.5 tonnes annually. The Swabian reports that the investment costs total 79,520.53 euros and the payback period is estimated at 5.6 years.

But what makes the CO2 balance of this photovoltaic system so positive? Loud 42 watts Photovoltaic systems have a significantly better CO2 balance than fossil fuels. The CO2 emissions from photovoltaic systems are 20 times lower than those of lignite, 15 times lower than hard coal and 9 times lower than natural gas. The majority of emissions occur during the production of the modules. These findings, combined with the fact that the operation of such a system causes almost zero emissions, make photovoltaics the most environmentally friendly alternative.

Environmental impacts and technologies

What is particularly exciting is the influence of production conditions on the CO2 balance. Solar panel manufacturing locations, such as China, where coal-fired power is often used, can significantly increase the carbon footprint. Modules from Europe often have a better CO2 balance. Factors such as the technology used also play a role: monocrystalline silicon modules offer higher efficiencies, while polycrystalline ones cause fewer emissions during production but deliver lower yields.
The energy payback period for photovoltaic systems in Germany is around 1 to 1.3 years. This means that after a short time the systems generate more energy than was needed to produce them.

Recycling is another important point Photovoltaics.info thematised. Solar modules are made of materials such as glass, aluminum and silicon and can be recycled, with recovery rates of over 80 to 95 percent achievable. Sustainability should be further promoted through recycling efforts.

Conclusion on Cologne’s commitment

The developments in Langenargen are just part of a larger movement in Cologne and other cities that are focusing on clean energy and taking important steps towards independence and climate protection. This photovoltaic system is a shining example of how communities can strengthen their energy independence while making a significant contribution to reducing CO2 emissions. This not only makes the lido ecological, but also raises awareness of sustainable energies.