Nordic household energy storage system

Battery energy storage systems (BESS) continue to play a vital role in the Nordic energy transition. Based on Marsh's experience in advising BESS owners in the Nordics, cold climate challenges, ensuring safety, and optimizing spacing are key topics that are discussed for BESS development in the region.

Methodology To evaluate the financial feasibility of implementing energy storage systems in residential buildings in Nordic climates, the use of energy storage technologies in combination with a solar PV system was modelled for detached houses employing different heating methods in Southern Finland.

Thus, to simulate the use of solar PV systems in Nordic climates, the model included scenarios with both a fixed solar PV capacity of 5 kW, representative of a typical residential solar panel in Finland, as well as with a fixed RF of 49 % for the house, with the solar PV capacity determined accordingly.

Lithium-ion batteries is the most cost-effective energy storage for detached houses. Selling surplus solar power to the electricity grid incentivizes investments. EU target of 49 % renewable energy in buildings in Finland requires economic support. Graphical analysis of possible high renewable shares in buildings is presented.

In order to evaluate the financial feasibility of integrating energy storage systems with solar PV system in detached houses, economic indicators able to compare the costs of the different storage scenarios with one another are needed.

Hence, the optimal capacity of all the energy storage systems is zero, whereas the feasible solar PV size is limited to below 20 % when using the 2019 electricity prices as comparison.