Energy efficiency and environmental aspects were strongly considered throughout the building’s construction phase. The building’s structures are designed for durability and easy maintenance, with life cycle calculations guiding design decisions.
In collaboration with SINTEF, ECO STOR and EcoFellows, the house is part of an innovative pilot focused on the reuse of electric vehicle (EV) batteries. Lempäälä is a pioneer in energy innovation, energy communities, and self-sufficient energy systems. Here, renewable energy sources are integrated into smart electricity grids, supported by technologies such as battery energy storage systems (BESS) to balance fluctuations in renewable energy production.
Technical information
The installed BESS has a rated capacity of 80kWh and a rated power of 40kW. The battery system helps reduce power peaks at Lempäälä House, stores excess energy from the building’s solar panels, shifts energy consumption to lower-cost periods, and provides stabilization and flexibility services to the power grid. It also enhances the building’s energy self-sufficiency.
Battery reuse is one of the key targets in Finland’s National Battery Strategy 2025. Reusing batteries extends their overall lifespan and thereby reduces environmental impact compared to batteries made from virgin raw materials. It also helps conserve Earth’s critical mineral resources. Material losses are significantly lower than in scenarios where raw materials are recycled.
At Lempäälä House, batteries store excess solar energy during the day for use during peak consumption periods, reducing electricity costs by minimizing grid tariffs and avoiding higher afternoon electricity prices. In the future, the battery system’s potential to provide grid stabilization services, earning payments from grid operators by supplying power during high-demand periods, will be explored.
The battery systems will operate and collect research data until 2026. Their performance will be continuously optimized based on collected data and experience. After the project period, the systems will remain operational to maximize resource use and can be easily relocated if needed.
Discover our other demonstration sites, Rudskogen Motorsports Centre and Trosvik School.
Lempäälä House – In short
Battery energy storage system
- Energy storage capacity: 80 kWh
- Power capacity: 40 kWh
Primary use of batteries
- Store surplus energy for solar panels to optimize self-consumption
- Peak shaving/grid support
