Lempäälä House’s Energy Storage Solution Sparked Interest – Electric Vehicle Batteries as Part of the Building’s Energy System

Energy storage solutions and their role in future energy systems are attracting growing interest. This was evident when Lempäälä House welcomed enthusiastic participants to a joint event hosted by the TREASoURcE and SIX Power projects earlier this year.

The event showcased Lempäälä House’s innovative energy storage system, which integrates solar panels with repurposed electric vehicle (EV) batteries. This pioneering circular economy solution gives EV batteries a second life as part of the building’s energy infrastructure. Attendees had the opportunity to explore the system firsthand.

*Image: Business Tampere, Pirkko Eteläaho*

Current Insights and Interactive Discussions

Expert presentations provided diverse perspectives on energy system development. Jyrki Alkio from the Ministry of Economic Affairs and Employment discussed the current state and future outlook of the battery industry. Visa Simola of Fingrid elaborated on the potential for small and medium-sized energy systems in balancing markets, while Jani Tuominen from Finnvera outlined investment support opportunities. Local insights were shared by Toni Laakso of Lempäälän Lämpö and Jari Saukko from Ekokumppanit, who detailed Lempäälä’s energy system and the TREASoURcE project’s battery pilot.

Designed to facilitate both information sharing and networking, the event featured concise presentations followed by ample time for discussion. Participants found the event successful and valued the chance to exchange ideas with experts and peers.

A concluding workshop gathered feedback and identified participants’ informational and support needs, highlighting a desire for follow-up events focusing specifically on second-life applications for batteries.

Giving Electric Vehicle Batteries a Second Life

The battery storage system at Lempäälä House utilizes EV batteries retired from transportation use. When a battery’s capacity diminishes to about 80% of its original level, it may no longer be suitable for vehicles but remains effective for building energy storage. Before deployment, these batteries undergo testing and reprogramming.

Managed by the Norwegian company ECO STOR, the system’s performance is monitored via telecommunications links. Despite some connectivity challenges, the system has operated as intended. Similar battery systems have been implemented in Norway at Rudskogen Motorsports Centre and Trosvik School as part of the TREASoURcE project.

The event successfully brought together experts and stakeholders, fostering a collaborative and constructive atmosphere. Feedback indicated a strong demand for similar events in the future. A heartfelt thank you to all participants—the collaboration to advance energy systems and the circular economy continues!