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EPV Energy has completed a major integrated energy system in Vaskiluoto, Vaasa. The Group’s subsidiary Vaasan Voima has expanded the high-temperature thermal energy storage facility at the power plant site and added new electric boiler capacity, creating one of Europe’s most advanced sector coupling solutions. This innovative system combines a very large thermal energy storage facility, electric boilers, combined heat and power (CHP) generation, and existing energy infrastructure in a way that enables renewable electricity to be converted into heat, stored over long periods, and utilized when energy is needed most.

Several positive observations were recorded during the audit conducted at Vaskiluoto in early March. These included, among other things, the significantly reduced carbon dioxide emissions resulting from Vaasan Voima’s operations, as well as the continued development work related to the thermal energy storage.

Vaasan Voima has joined the Energy Efficiency Agreement for the period 2026–2035. Through this agreement, Vaasan Voima commits to improving the energy efficiency of its operations by the end of 2035.

The expanded thermal energy storage will enable the storage and delivery of non-combustion-based energy even during the coldest winter months. Commercial production of the thermal storage will begin in early 2026.

Zero deviations and only five observations underline Vaasan Voima’s nearly perfect audit result. Vaasan Voima received praise in the external audit for, among other things, considering energy efficiency in production development.

Vaasan Voima’s significant investment will increase the capacity of the Vaskiluoto thermal energy storage (TES) facility to 17 gigawatt-hours. This will meet the demand for district heating better than ever before, even in the coldest winter months. The extension of the thermal energy storage facility will be completed by late 2025. The Finnish Ministry of Economic Affairs and Employment has granted investment aid of over EUR 5.8 million for the project.