I am not an electrical grid engineer. But I calculate battery profitability, optimize their operation, etc., for a living, so it’s closely related.
- The assumption that the battery would be used in the energy market is incorrect. Batteries are primarily for FCR and FFR use. These are low-energy frequency markets that are nationwide in Finland.
In other words, to put it bluntly, location doesn’t matter; adjustments are made based on the grid frequency, which is the same throughout Finland.
More restrictions are caused by transformers that are capable of accommodating batteries.
That specific use case is indicated, for example, by the Power-to-Energy ratio, which I believe was 1.
That battery energy, what was it, 30 MWh? It would last about 5 minutes, if even that, for the consumption of any larger city.
Fingrid can use the battery for special adjustments where location matters, but Merus’s batteries are not in the mFRR market where these special adjustments would be implemented.
Even in this case, the division on the energy side is made into only 3 parts.
South - Central - North, even though Fingrid could, in principle, activate them based on location. So, these batteries are not in such a market.
It is not primarily profitable for them. The cost per cycle is too high.