Mine Storage

About

Founded in 2020, Mine Storage is a private headquartered in Stockholm, Sweden specializing in Hydro, Energy Storage.

Mine Storage is a Swedish project developer specializing in converting closed and water-filled underground mines into pumped hydroelectric storage facilities. The company uses proven pumped hydro technology adapted for underground settings, utilizing height differences within mines to pump water between upper and lower reservoirs. Systems are designed for grid-scale deployment (15-200 MW, 30-2400 MWh capacity) with discharge durations of 2-12 hours, generating revenue through electricity trade arbitrage and ancillary services such as grid frequency control. Mine Storage manages the complete project development and operations process, from site assessment and permitting to construction and operation. The company has partnerships with Voith Hydro for equipment supply and is developing multiple projects across Sweden and Finland, including flagship projects in Norberg and Vånga. Round-trip efficiency typically ranges 70-85%.

Projects