Polar Night Energy, the firm behind the technology, says sand batteries can help cut emissions and reduce costs.

At Polar Night Energy, co-founders Tommi Eronen and Markku Ylönen use sand to store wind and solar energy as heat, providing ...

The midnight sun is a natural phenomenon. It occurs in regions near the Arctic and Antarctic circles. During summer, the sun remains visible for weeks ...

In high latitudes, the sun is an unreliable companion. It lingers long past midnight in summer, washing mountains and shorelines in a perpetual glow, then abandons the horizon entirely in winter, ...