Hitachi Energy has been selected to deliver the grid connection infrastructure for the 640 MW Marguerite Lake Compressed Air Energy Storage (CAES) Project in Alberta, Canada. The large-scale energy storage facility is being developed near La Corey by Cache Power, Federation Group, and EllisDon, and is expected to become one of Canada’s most significant long-duration energy storage projects.
The Marguerite Lake project is designed to provide up to 640 MW of generation capacity with approximately 48 hours of energy storage, helping Alberta strengthen its electricity grid as renewable energy capacity continues to grow. The facility will store surplus electricity during periods of low demand and release it back into the grid when electricity consumption rises, improving overall grid flexibility and reliability.
As part of the project, Hitachi Energy will design, engineer, supply, and construct the critical substation infrastructure required to connect the storage facility to the Alberta Interconnected Electric System (AIES). The grid connection will serve as the primary interface between the CAES plant and Alberta’s transmission network, ensuring efficient and reliable power delivery.
The storage system will use solution-mined underground salt caverns located around 1,100 metres below ground within Alberta’s Lotsberg salt formation. These naturally occurring geological structures provide suitable conditions for storing compressed air safely, enabling long-duration energy storage that can support renewable power integration and improve energy security.
Long-duration energy storage projects like Marguerite Lake are expected to play an increasingly important role in balancing intermittent renewable energy sources such as wind and solar. By storing excess electricity and dispatching it when needed, the project will contribute to grid resilience while supporting Alberta’s transition towards a cleaner and more flexible electricity system.
With Hitachi Energy providing the grid connection infrastructure, the Marguerite Lake CAES project marks another major step in advancing Canada’s long-duration energy storage capabilities. Once operational, the facility is expected to enhance power system stability, improve renewable energy integration, and strengthen the province’s energy infrastructure for future electricity demand.
