Augsburg

Climate-friendly living in Augsburg –

Commercial power-to-gas plant using methanisation as a partially self-sufficient
and emission-reduced energy supply for 70 flats in existing housing construction

For the first time in the world, a decentralised power-to-gas system was installed in an old residential complex. The innovative energy supply using green electricity and heat was supplied and installed by EXYTRON. The project was commissioned and initiated by Stadtwerke Augsburg, a municipal utility company, in a housing estate (existing housing construction) of the Augsburg housing group, which has been in existence since 1974.

A photovoltaic system has been installed on the roof of a recently (according to KfW 100) renovated block of flats from 1974, with almost 5,400 square metres of living space. The green electricity is first consumed directly by the tenants, and surplus electricity is used to produce hydrogen with an electrolyser. This is immediately converted into synthetic, renewable natural gas, with carbon dioxide, and can easily be stored in tanks on site. When required, heat and power is generated for the tenants from this natural gas, using a normal combined heat and power plant and condensing boilers.

A closed cycle
The CO2 released during the combustion in the CHP plant is collected and constantly reused as a recyclable material to produce synthetic natural gas from hydrogen. The innovative SmartEnergyTechnology reduces the emission of carbon dioxide, nitrogen oxide and fine dust by up to 100 percent.

Utilisation rate of around 90%
The result of preferential direct use of electricity from the PV system and an intelligent, anticipatory energy management system to control the production, storage and consumption of electricity and heat in the building, results in an unprecedented degree of efficiency of more than 90% of the self-generated energy.

This highly efficient effect cycle, patented by EXYTRON, significantly reduces the CO2 footprint of the old, renovated building block to below a Passivhaus Plus standard that has never before been reached by existing buildings.
This means that the German government’s climate protection standard, which is only scheduled for the year 2050, can already be implemented today for older existing buildings.

Installation of the storage tanks next to the housing estate in Augsburg.

From left to right: Alfred Müllner, Managing Director of Stadtwerke Augsburg, Dr. Mark Dominik Hoppe, Managing Director of Wohnbaugruppe Augsburg, Dr. Kurt Gribl, Lord Mayor of the City of Augsburg (2008 – 2020), Dr. Albrecht Meier, Manager EXYTRON.

This means that the German government’s climate protection standard, which is only scheduled for the year 2050, can already be implemented today for older existing buildings.

Energy costs remain stable for tenants
The system can be easily installed in existing buildings.

If the self supply cycle is interrupted, electricity and gas connections ensure that energy and heat are still available. Despite environmentally friendly supply, the energy costs for the tenants in the 70 flats remain stable, thus ensuring that the flats are renovated in a socially acceptable manner.

This particular, socially acceptable conversion of older housing to climate-friendly energy supply systems is why the Federal Environmental Agency is providing support for the project with the research program TRAFIS.