Seasonal Heat Storage Tender

Scope Construction of seasonal heat storage in Vantaa Finland for Vantaa Energy using the alliance model. The companies will jointly plan the work and implementation of the project to match Vantaa Energys goals and determine the target cost as well as the incentive scheme during the development phase. Vantaa Energy will plan the implementation of the investment and the transition to the implementation phase at the end of the project development phase. During the implementation phase YIT and AFRY Finland will be responsible for the construction of what is claimed to be the worlds biggest seasonal heat energy storage underground. The size of the facility will be about one million cubic metres and will have around 90 gigawatt hours of capacity. YIT stated that the seasonal heat storage is the most important part of Vantaa Energys Fossil-free 2026 project with which the company aims to completely stop usage of fossil fuels by 2026. The development phase of the project is scheduled to begin in this summer with construction planned in autumn 2022. Furthermore work on the contract is anticipated to be concluded in 2026. The seasonal heat storage is a key part of our innovative investment programme that combines new technological solutions and allows us to phase out fossil fuels in energy production as quickly as possible.