Why do flow battery developers need a longer duration system?

Flow battery developers must balance meeting current market needs while trying to develop longer duration systems because most of their income will come from the shorter discharge durations. Currently, adding additional energy capacity just adds to the cost of the system.

How long can a flow battery last?

The hard, silvery-gray transition metal vanadium (not to be confused with vibranium) lends itself to simplicity in flow battery design because it can exist in four different states of oxidation. Stryten, for example, notes that its vanadium flow battery can operate for more than 20 years without losing storage capacity.

Where can flow batteries be used?

Flow batteries are already in use at scale around the world – Rongke Power connected the world’s largest flow battery to the grid in China in 2022 and CellCube has several North American flow battery installations providing grid services in partnership with G&W Electric.

What is the difference between a flow battery and a rechargeable battery?

The main difference between flow batteries and other rechargeable battery types is that the aqueous electrolyte solution usually found in other batteries is not stored in the cells around the positive electrode and negative electrode. Instead, the active materials are stored in exterior tanks and pumped toward a flow cell membrane and power stack.

Are flow batteries a low-cost long-term energy storage technology?

In an August 2024 report “Achieving the Promise of Low-Cost Long Duration Energy Storage,” the U.S. Department of Energy (DOE) found flow batteries to have the lowest levelized cost of storage (LCOS) of any technology that isn’t geologically constrained. DOE estimates that flow batteries can come to an LCOS of $0.055/kWh.

What is a Technology Strategy assessment on flow batteries?

This technology strategy assessment on flow batteries, released as part of the Long-Duration Storage Shot, contains the findings from the Storage Innovations (SI) 2030 strategic initiative.