Long-duration energy storage (LDES) developer-operator Hydrostor intends to enter its compressed air storage project into Ontario, Canada’s recently announced LDES procurement.

What are the system needs that LDES is going to solve, and what technologies are most appropriate for those applications?

Update 28 April 2026: Following publication of this story, Hydrostor reached out to clarify some of the conditions detailed below and provided a statement.

Iron flow battery company ESS Tech Inc highlighted its recent partnership with Google and the acquisition of VoltStorage GmbH, as profitability remained out of reach in 2025.

The LDES Council’s policy team discusses the role of policy and markets in scaling long-duration energy storage globally with ESN Premium.

Global long-duration energy storage (LDES) deployment figures soared in 2025, but newer technologies risk being outcompeted by the incumbent, lithium-ion (Li-ion).

In this US news roundup, CC Power signs an agreement with Hydrostor for 400MWh of its Willow Rock LDES project, PowerSecure builds microgrids in New Mexico, and ESS Inc acquires VoltStorage.

Long-duration energy storage (LDES) developer-operator Hydrostor has announced a strategic technology and equity agreement with energy infrastructure equipment manufacturer Baker Hughes.

Lithium-ion companies have come out as the top-rated suppliers on a new long-duration energy storage (LDES) leaderboard, while CO2 Battery company Energy Dome is the highest non-lithium company.