Redflow Limited is an Australian manufacturer of zinc-bromine flow batteries, established in 2005 in Brisbane. The company specialized in developing energy storage solutions for telecommunications, commercial, industrial, and residential applications. Their products were designed to provide long-duration energy storage capabilities, supporting the integration of renewable energy sources into various power systems. The company’s innovative approach to battery technology earned recognition across multiple markets, with installations in over 250 sites spanning nine countries.
Battery Technology
Redflow’s core technology centered on zinc-bromine flow batteries, which utilized a unique combination of zinc and bromine elements to store and deliver electrical energy. Their flagship product, the ZBM3 module, delivered 10kWh of energy storage capacity and could be fully discharged without affecting its lifespan – a significant advantage over traditional battery systems. The technology incorporated a water-based electrolyte, making it inherently fire-resistant and suitable for deployment in sensitive environments.
The company’s product range included the Quadpod system, which combined four ZBM3 batteries to provide 40kWh of storage, and the Energy Pod200, a larger-scale solution housing 20 ZBM3 batteries. These systems achieved 70-80% efficiency while offering superior thermal stability compared to conventional lithium-ion batteries. Redflow’s batteries were particularly effective in harsh environmental conditions, operating reliably without requiring additional cooling or heating systems.
Before ceasing operations, Redflow was developing the X10 battery, a new large-scale storage solution aimed at utility-scale applications. This technology was being created in partnership with Stanwell to address the growing demand for grid-scale energy storage solutions.
Recent Projects
Prior to its closure in October 2024, Redflow was involved in several significant projects, including a 2MWh commercial and industrial installation in California and plans for a larger 20MWh project in the same state. The company had also secured support from the U.S. Department of Energy for microgrid projects. However, these initiatives were halted when Redflow entered voluntary administration in August 2024 due to insufficient funding to scale operations.
Investors
Notable shareholders included Simon Hackett with 2.365% ownership (8,411,727 shares), Mfs Fund Pty Ltd holding 1.105% (3,929,579 shares), and Simon Mark Fagg with 0.9124% (3,245,072 shares). Additional significant investors were Dowling Properties Pty Ltd (0.7925%) and John Richard Serisier (0.6272%). Despite this investor base, the company was unable to secure adequate capital to continue operations, leading to its closure in late 2024.
Business Details
Location: Brisbane, Australia
Website: https://redflow.com
LinkedIn: https://www.linkedin.com/company/1207092
