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Customer application

The Autonomous Alpine Town

Transparent supply routes and autonomous, automated power and water supply – the Immenstadt public utility company in the Allgäu region relies on these and has done so with WAGO since 2009. Automation and telecontrol technology make this possible and clarify the potential for expansion and savings at the same time.

Over 14,000 residents, 30 square miles (80 km²), all at 2,400 feet (730 m) above sea level. Immenstadt in the Oberallgäu district of Swabia is a tranquil locale. But it would be a mistake to assume that time stands still in this idyllic Alpine town – the Immenstadt public utility company, a municipally owned and operated enterprise, is focusing on sustainable technology for municipal energy management and the distribution of district heating, as well as for the water supply, wastewater management and even flood control.

“The modular WAGO I/O-System simplifies plant control and system monitoring. It improves the energy management, reduces the calculation effort for the energy supply and makes it possible to integrate remote stations into the network smoothly,” says Paul Müller of ETM Elektro- und Systemtechnik in summary. His company is handling the planning on site as the system integrator.

But what specific technical products does this involve? “To be exact, since 2009 we have been using the 750-841/-881 Controllers and the PFC200, as well as the 750-652 Serial Interface,” says Paul Müller, listing the products in detail. A total of 45 systems have been equipped with this technology to date: 18 water supply stations, 13 wastewater plants, five systems belonging to the building management of the public utility company, three for flood control measures, five in district heating and one drinking water power plant.

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Transparency and Innovation

The biggest advantage of the WAGO controller technology for the Immenstadt public utility company is that every supply route can be monitored and controlled comprehensively and transparently. A central process control system (Flow-Chief) is used to collect, visualize and archive the data and to forward the error messages for the on-call service.

In addition, the monitoring of the existing systems also simplifies billing for the energy supplied: “The existing M-Bus interface allows all third-party products of the energy meters to be read and the meter values to be stored and processed by them directly in the process control and energy data management systems,” explains Paul Müller.

The Immenstadt public utility company is focusing on independence for heat and electricity generation – with renewable energies. The town generates its own heat with a biomass heating plant. This heating network is monitored with WAGO controllers. The public utility company generates electricity with photovoltaic systems. And hydroelectric power has also been used since the middle of October 2017. The large elevation differences in the supply area and a 55 kilowatt Pelton turbine in the drinking water pipeline make this possible. This connection of the systems to the public utility company’s control center has also been implemented with WAGO controllers, says Paul Müller.