As you know, efficient energy storage systems are the conundrum of making the most out of intermittent renewable energy. Unless you’ve had your head in the sand, it’s a glaring problem we have to solve, which is why so many different battery technologies are being explored and developed. To the point that some of them are now coming out of the sand … that’s what recently happened in Finland where the world’s first commercial sand battery technology went live this past July. How does it work and is it a viable path for storing energy? Let’s see if we can come to a decision on this.