The Attersee 6MWh battery storage project, independently financed and developed by Expert Nöhmer GmbH with SOLPRO GmbH as the EPC partner, has recently entered commercial operation in Austria. It is the largest battery storage system of its kind in Upper Austria, deploying four Dunext PowerMount-P700-1505kWh storage units with a total capacity of 2.8 MW/6 MWh. With a total investment of approximately EUR 2.5 million, the project is expected to generate a projected annual return of around 26%, with an estimated payback period of approximately 3.8 years.

Market Opportunity and Project Background

Austria’s electricity consumption is expected to double by 2040, driven by continued growth in variable renewable energy capacity and increasing demand for flexible resources capable of supporting grid balancing and frequency stability. Price volatility in the day-ahead and intraday electricity markets creates opportunities for energy arbitrage, while primary and secondary frequency regulation services provide stable revenue streams. The ELWG grid-fee exemption policy further reduces operating costs and helps shorten the payback period for storage projects.

Against this backdrop, Expert Nöhmer GmbH identified the commercial potential of standalone battery storage as an investable asset class and decided to develop the project through a privately financed model. Following a comprehensive evaluation of multiple storage suppliers’ technical solutions, delivery capabilities, and service systems, Dunext was selected as the storage system partner for the project. The decision was driven by the differentiated advantages of the PowerMount solution, including 400V low-voltage coupling, fast frequency-response capability and cluster-level battery management, as well as Dunext’s deep understanding of the requirements of the Austrian electricity market.

400V Low‑Voltage Coupling for Lower CAPEX and Faster Delivery

The PowerMount system is connected via a 400V low-voltage distribution at the transformer. The 400V low-voltage distribution is already prepared for the future addition of up to 1 MW of EV charging infrastructure and up to 1 MWp of PV, allowing these systems to be connected easily without requiring dedicated 690V or 800V infrastructure. Since 400V is the industry standard for commercial and industrial facilities, the platform provides a cost-effective, flexible, and future-proof solution for evolving energy needs.

Fast PCS Response and Cluster‑Level Management for Frequency Regulation

With a response time of under 200 milliseconds, the Power Conversion System (“PCS”) delivers high‑precision power control that accurately follows grid dispatch commands, meeting the technical requirements of both primary and secondary frequency regulation markets.

Cluster-level battery management allows each battery cluster to be monitored and controlled independently. In the event of a fault affecting a single cluster, the remaining healthy clusters can continue operate, preventing a localized issue from taking the entire system offline. This architecture improves overall system availability, reduces unplanned downtime and helps maximize revenue from grid services.

The project revenue is derived from: energy arbitrage in the day-ahead and intraday markets, primary and secondary frequency regulation service income, and cost savings from the ELWG grid fee exemption. The combined effect of these revenue streams supports the project’s expected 26% projected annual return and estimated 3.8‑year payback period.

Full‑Lifecycle Service Support Reducing Delivery and Operational Risk

Throughout project execution, Dunext deployed four engineers to the site to support wiring inspections, fault diagnosis and coordination with the third-party Energy Management System provider. This close on-site collaboration helped ensure that the system was commissioned and connected to the grid in line with the customer’s operational requirements.

The after‑sales service framework includes: 30‑minute hotline response, on‑site engineer dispatch within 48 hours in key markets, spare parts availability, and annual inspection and preventive maintenance visits, covering the full project lifecycle from solution design and grid connection commissioning to long‑term operations and maintenance.

From Project Delivery to Long-Term Market Value

The Attersee project represents a flagship application of Dunext PowerMount in the European frequency regulation market. It also provides a practical example of how standalone battery storage can be developed as a bankable and revenue-generating asset. The successful commissioning of this project demonstrates Dunext’s ability to deliver advanced energy storage solutions and provide responsive, localized service support in the European market.

Reflecting on the project journey, a statement from Expert Nöhmer GmbH captures the foundation of the partnership (translated from German to English): “Projects like this are not built from concrete, steel or batteries alone. They are built on trust.”

What ultimately enabled the project to progress from initial concept to commercial operation was the mutual trust established through every stage of collaboration, from technical discussions and solution development to on-site delivery and grid connection.

Looking ahead, Dunext will continue to develop flexible, efficient and reliable energy storage solutions tailored to the evolving needs of the European electricity market. By supporting investors, project developers and energy companies, Dunext aims to accelerate the transformation of battery storage from essential power infrastructure into a sustainable, value-generating energy asset.