The Energy Storage Report 2024

Now available to download, covering deployments, technology, policy and finance in the energy storage market

Developers SENS and Callio working on hybrid BESS, pumped hydro and PV project in Finland


Developers SENS and Callio have revealed a hybrid project in Finland which could combine a battery energy storage system (BESS), pumped hydro energy storage and solar PV technology.

The companies have struck a principal agreement to develop the project at the decommissioned Pyhäsalmi mine in Pyhäjärvi, central Finland.

This article requires Premium SubscriptionBasic (FREE) Subscription

Enjoy 12 months of exclusive analysis

  • Regular insight and analysis of the industry’s biggest developments
  • In-depth interviews with the industry’s leading figures
  • Annual digital subscription to the PV Tech Power journal
  • Discounts on Solar Media’s portfolio of events, in-person and virtual

Or continue reading this article for free

The location will allow the project to utilise existing grid infrastructure and integrate with the nearby Callio Business and Olcconen Green Industrial parks, SENS (Sustainable Energy Solutions Sweden Holding) said.

SENS is primarily a BESS project developer active mostly in Sweden while Callio is owned by the Pyhäjärvi Municipality.

The BESS portion of the project is designed for a power output of 85MW and is already at the ready-to-build (RTB) stage, with commercial operation expected in 2025. It will provide frequency response services and participate in the energy arbitrage market, SENS said.

The pumped hydro energy storage (PHES) unit would be a 75MW/530MWh, 7-hour system built underground though a timeline for its development, construction or operation was not provided. The third stage of the project is a solar PV plant but details on size or timeline were not provided either.

The Pyhäsalmi mine is the deepest metal mine in Europe at 1,444 metres deep and its underground mine operation and copper and zinc processing ended in 2022, although some above-ground refining is set to continue until 2025. The underground mine is currently in the closure and decommissioning stage. It is owned by Canadian company First Quantum Minerals.

Financing for the project will be shared between SENS, Callio, the Calllio Business and Olcconon business and industrial parks, UB Corporate Finance and the Finnish government via €26.3 million (US$28.5 million) in subsidies for foreign direct investments (FDI) in renewable energy.

Axpo, a Switzerland-headquartered independent power producer (IPP) and energy trading firm, has also launched projects in neighbouring Sweden, commissioning a 20MW project in February which was acquired from SENS. A month prior SENS secured the land for another 40MW BESS project.

Sweden and Finland are leading BESS deployments in the Nordic region largely off the back of a lucrative ancillary services market.

8 October 2024
San Francisco Bay Area, USA
PV Tech has been running an annual PV CellTech Conference since 2016. PV CellTech USA, on 8-9 October 2024 is our second PV CellTech conference dedicated to the U.S. manufacturing sector. The event in 2023 was a sell out success and 2024 will once again gather the key stakeholders from PV manufacturing, equipment/materials, policy-making and strategy, capital equipment investment and all interested downstream channels and third-party entities. The goal is simple: to map out PV manufacturing in the U.S. out to 2030 and beyond.
17 June 2025
Napa, USA
PV Tech has been running PV ModuleTech Conferences since 2017. PV ModuleTech USA, on 17-18 June 2025, will be our fourth PV ModulelTech conference dedicated to the U.S. utility scale solar sector. The event will gather the key stakeholders from solar developers, solar asset owners and investors, PV manufacturing, policy-making and and all interested downstream channels and third-party entities. The goal is simple: to map out the PV module supply channels to the U.S. out to 2026 and beyond.

Read Next

June 13, 2024
Developer Ethical Power has received planning consent for a 65MW solar-plus-storage project near Christchurch, New Zealand.
June 11, 2024
US-based independent power producer (IPP) NextEra and utility Entergy have revealed a five-year, 4.5GW development pipeline of solar and storage projects.
June 11, 2024
Telecoms specialist Elisa is deploying battery and PV systems at base towers in Finland, which will “implement virtual power plant (VPP) optimisation of locally produced solar energy.”
June 11, 2024
Editor Andy Colthorpe speaks with Yann Brandt, chief commercial officer at FlexGen, a solar industry veteran who saw the rising potential of the energy storage industry and jumped on board.
June 10, 2024
AES Corporation has withdrawn one of its solar and battery storage hybrid facilities from Hawaiian Electric Co’s (HECO’s) latest renewable energy procurement.

Most Popular

Email Newsletter