The energy management system of the future

Your partner for sustainable solutions & concepts



"It's not in the stars to hold our destiny but in ourselves."


- William Shakespeare -

Generating energy, utilising energy, managing energy supplies. Those who focus their company on these services are inevitably helping to shape the future of our planet. Our responsibility is obvious. A respectful attitude and sustainable thinking are the bedrock of the EnergyOnSite philosophy and play a key role in the creation of new technologies.


EnergyOnSite stands for innovative energy concepts and revolutionary electricity utilisation through self-sufficient and secure supply systems for every consumer.

Whether industry, hospitality, agriculture, mountain huts or private households - EnergyOnSite is your competent partner for the realisation of forward-looking photovoltaic battery storage projects with corresponding energy management.


Discover your exclusive & customised solution at EnergyOnSite. From PV in-roof modules and the right storage technology to intelligent energy management systems (EMS), we supply everything you need for your efficient and revolutionary energy project.

Strategic ASFINAG Project

45 Battery Energy Storage Systems for ASFINAG Sites Across Austria 


This large-scale project comprises the main construction works for the deployment of 45 Battery Energy Storage Systems (BESS). The key activities include the delivery, transportation, and joint commissioning of the systems at the respective ASFINAG sites across Eastern, Central, and Western Austria.

The cabling and connection to the existing high-voltage power grid will be carried out by a dedicated installation contractor in accordance with the specifications provided by the supplier.

In addition, the foundations for the containerized solutions will be constructed by the same contractor based on the load specifications supplied by the manufacturer.

Project Objectives

1. Installation of Battery Energy Storage Systems (BESS) at various locations with a total storage capacity of 25.25 MWh.

2. Ensuring the proper delivery, transportation, and commissioning of the systems.

3. Guaranteeing correct cabling and reliable connection to the high-voltage power grid.

4. Construction of stable foundations for the containerized solutions.

5. Coordination and alignment with all relevant project stakeholders prior to the commencement of work.

Major BESS Project in Amstetten

Battery Energy Storage System for Stadtwerke Amstetten 


Stadtwerke Amstetten is currently implementing a pioneering large-scale project involving the installation of a modern Battery Energy Storage System (BESS). The objective is to make the regional energy supply more sustainable, flexible, and resilient in the face of future challenges and potential crises.


The project includes the following technical and functional specifications:


  • Provision of ancillary services: The system will provide both Primary Frequency Control Reserve (FCR) and Secondary Control Reserve (aFRR) and will actively participate in the energy market.

  • Black-start capability & emergency power supply: In combination with the existing hydropower plant, the system will ensure a reliable power supply to local consumers at the power plant site as well as the Pölz Hall in Amstetten in the event of a grid outage.
  • Reactive power management: The system is capable of supplying and compensating reactive power, thereby improving overall grid stability.
  • Self-consumption optimization: Energy generated from hydropower or photovoltaic systems can be efficiently stored and used for on-site consumption.
  • Future-proof scalability: The installation is modular and expandable, making it ideally suited to meet future requirements and growing energy demands.

Technical Specifications of the System


    • Active Power: 1 MW  
    • Reactive Power: 220 kVAr
    • Energy Storage Capacity: 2.24 MWh
    • System Configuration: Containerized solution
    • Grid Connection: 20 kV connection via a 1,250 kVA oil transformer
    • With this project, Stadtwerke Amstetten is setting a strong example for the regional energy transition, security of supply, and technological innovation.

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Why EnergyOnSite?

Re-thinking energy

There are many manufacturers of storage systems and providers of all aspects of power supply. But what use are batteries without a grid connection or energy sources that are not integrated into control or storage systems? energyonsite not only has the knowledge and experience of many generations, but also all the capacities to transform energy sources into your individual, innovative energy concept. You can rely on our expertise
to build your future.

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