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.

How long do flow batteries last?

Valuation of Long-Duration Storage: Flow batteries are ideally suited for longer duration (8+ hours) applications; however, existing wholesale electricity market rules assign minimal incremental value to longer durations.

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 does a flow battery work?

A flow battery contains two substances that undergo electrochemical reactions in which electrons are transferred from one to the other. When the battery is being charged, the transfer of electrons forces the two substances into a state that’s “less energetically favorable” as it stores extra energy.

Who are flow battery subject matter experts?

The Framework Team interviewed 26 flow battery subject matter experts (SMEs) who represented 20 organizations, ranging from industry groups (e.g., ESS, Inc., Lockheed Martin Corporation) to vendors (e.g., Primus Power, Largo Inc.) and National Laboratories (e.g., SLAC National Accelerator Laboratory).

What is China's first megawatt iron-chromium flow battery energy storage project?

China’s first megawatt iron-chromium flow battery energy storage demonstration project, which can store 6,000 kWh of electricity for 6 hours, was successfully tested and was approved for commercial use on February 28, 2023, making it the largest of its kind in the world.