Battery storage potential in meeting NZEB energy performance requirements in Estonia

This paper analyses the potential of using batteries to meet the minimum energy performance requirements for buildings in Estonia. The study uses two editions of the local regulations, both current and the forthcoming edition including explicit PV and battery simulation. Analysis using data from 24 projects across nine building types revealed that a 25% battery-to-solar power ratio is the most cost-effective. of Batteries were financially viable ifthe self-use ratio was below 70% and the PV-to-floor-area ratio above 0.020 kW/m².

School buildings exhibited a distinct trend, suggesting a lower viability threshold. The study concludes that battery use can be financially viable depending on the building specifics, with the identified ratios providing a useful guideline across various building types. These findings are consistent across both editions of the regulation used in the analysis.