Finnish City Inaugurates 1 MW/100 MWh Sand Battery

If they did, and it indicated that it's not just a money pit they would have shared it, so doubtful. As with most things in Europe it was likely done on the basis of a virtue signaling assessment alone. Europe's motto is going to keep saying "we have the resources" until it rapidly runs out of resources.

Norway's sovereign wealth fund will likely be completely gone in 20 years and will leave large swathes of the population without a pension because the Norwegian government works on the philosophy of "it's going to be okay, we have infinite money", already it's showing cracks as the only thing they actually have the money for is to make inflation skyrocket.