Bremen Building Management System

Location: Bremen, Germany

Population: 569,352 [city area]

Climate: Oceanic

Duration: 2003-N/A

Sector: Buildings

Funding sources: Public

City networks: N/A

Savings:  Energy savings by 15 to 18%.

Solutions: Implementation of a building management system (BMS) through the Wonderware solution in the city of Bremen.

Multiple benefits: The new BMS brought greater control and provided far-reaching positive effects across the city’s extensive portfolio of properties [source].

In 2003 the city of Bremen developed a Centralized Concept to unify more than 1,200 municipal facilities under a unique building control system.

During the first phase, the city’s property service company (Immobilien Bremen Anstalt des öffentlichen Rechts) elaborated both an assessment of the current energy consumption use and a future roadmap, to emphasize all the possible cost-effective heating solutions. The company identified the Wonderware solution as the best option available to optimize energy consumption through a single operator interface able to record data and increase overall efficiency.

Objective – Unify more than 1,200 municipal properties under a single, open BMS and optimize the efficiency of heating systems in the buildings to cut energy consumption [source].

Solutions – Immobilien Bremen determined that the Wonderware solution would meet the city’s requirements for an open, vendor-agnostic BMS that would consolidate the various existing systems under a single operator interface [source].

Wonderware solution, it is a software that collects data and produces reports for each building’s performance. In this way, more than 1200 municipal properties have been unified under a single open building management system. Six controls facilities are in charge of managing these buildings, while the supervision of the whole property is committed to five geographical districts and regional supervisors, which can access each heating system from a single and centralized location.

Thanks to the implementation of this system, it is possible for each supervisor working from any location to solve problems that might arise from any buildings located across the City of Bremen in real-time.

In short, the solution adopted by the City of Bremen is based on two main pillars: · Cutting energy consumption: Optimize the efficiency of the heating systems; · Consolidating the building management system (BMS).

Funding – N/A

Innovation –The smartness of the software employed, enabled integrated data transfer between all the different control buildings involved, saving costs and energy.

Success factors – To obtain system integration, one important challenge was to make data and information consistent in format, allowing for sharing and reporting among the regional supervisors. Wonderware solution allowed consistency in data gathering and structuring, making information processing quicker and more transparent to the local and regional entities, who need to interpret and reuse data in order to implement policies.

Also, the implementation of a central server facilitated an increase in coordination and avoided financial waste. In particular, important savings occurred for employees and engineers and their learning process, since they started using only one IT language, instead of the different ones that were needed before.

Significant outcomes:

The benefits obtained from the solution are in particular linked with the following main impacts.

  • 15 to 18% in energy savings;
  • The control perimeter of the solution increased to more than 1,200 municipal properties;
  • Approximately € 30,000 cost savings per year;
  • Transparency of energy administration.
  • Simplicity and efficiency regarding the addition of buildings to the system due to the extensibility of the Wonderware software [source].


Synergies with local policies:

  • Bremen Climate Protection and Energy Act (BremKEG) has been in force since March 27, 2015, where the state of Bremen has defined requirements and framework conditions for protecting the climate and adapting to climate change.
  • The 2020 climate protection and energy program aims to reduce Bremen´s CO2 emissions by at least 40% by 2020 compared to 1990. The climate protection goals can only be achieved if the entire system of energy supply and use is completely restructured.
  • Enforcement of the Energy Saving Ordinance (EnEV) and the Renewable Energies Heat Act (EEWärmeG) in Bremen. The EnEV stipulates nationwide requirements for the energy consumption of new buildings, building expansions and conversions. Moreover, according to EEWärmeG there is also an obligation to use renewable energies for heating and cooling or to carry out replacement measures for new buildings.

Political alignment:

  • National Action Plan on Energy Efficiencyincludes 3 main cross-sectoral energy efficiency measures: stepping up energy efficiency in the building sector; establishing energy efficiency as an investment and business model; increasing individual responsibility for energy efficiency;
  • Energy Concept 2050sets goals of 20% energy savings by 2020 (2008 baseline) and 50% energy savings in buildings by 2050 (2008 baseline). The key pillars of the concept are an intensification of the use of renewable energies and reduction of energy consumption by increasing energy efficiency;
  • Climate Action Plan 2050guides to all areas of action in the process to achieve domestic climate targets in line with the Paris Agreement. The ultimate goal is to reach extensive greenhouse gas neutrality by 2050;


Immobilien Bremen and the City of Bremen are making plans for future extensions of the Wonderware solution. Since Wonderware is an international company with worldwide support capabilities, they will be able to reap the rewards of their initial investment and continue to experience improved energy efficiency [source].

One of the most relevant examples of the application of a Wonderware solution is represented by Carson City.

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Sector: Buildings

Country / Region: Germany

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In 1 user collection: Good practices of cities

Knowledge Object: User generated Initiative

Published by: European Union