Gravitricity weighs up one of Europe’s deepest mines

Located about 450km north of the Finnish capital Helsinki, the Pyhäsalmi Mine extends 1,444m below the Earth. With mine operations at Pyhäsalmi winding down, the local community set up a development company to explore redevelopment projects around the mine’s infrastructure, including energy storage.

Gravitricity is set to deploy its GraviStore energy storage technology in a 530m deep auxiliary shaft. GraviStore can utilise off-peak electricity by raising heavy weights in the mine shaft, releasing the energy back on to the grid during high demand by lowering the weights. It’s claimed the 2MW scheme at Pyhäsalmi will provide grid balancing services to the Finnish network.

“This project will demonstrate at full scale how our technology can offer reliable long life energy storage that can capture and store energy during periods of low demand and release it rapidly when required,” said Martin Wright, Gravitricity executive chairman.

“This full-scale project will provide a pathway to other commercial projects and allow our solution to be embedded into mine decommissioning activities, offering a potential future for mines approaching the end of their original service life.