Flux XII Inc.

Flux XII Inc. , based in Wisconsin, specializes in developing advanced long-duration energy storage solutions that transform intermittent renewable energy into reliable grid capacity. Founded in 2021 and headquartered in Madison, Wisconsin, Flux XII Inc. focuses on long-duration energy storage.

The company has successfully completed 1 deal, with its most recent funding round being a Seed round that raised USD 3. 95 mn led by Grantham Foundation, with support from Desai Ventures, Wisconsin Alumni Research Foundation, and gener8tor. The total amount raised by the company stands at USD 3. 95 mn.

Flux XII, Inc. specializes in long-duration energy storage solutions that convert intermittent renewable energy into reliable baseload grid capacity. The company's core products include advanced flow battery systems, membranes, and electrolytes, each designed to enhance the efficiency and longevity of energy storage. These products address critical challenges in energy management, particularly for applications in data centers, commercial and industrial sectors, and utility-scale projects.

The company targets markets in North America, Europe, and Asia, serving a diverse client base that includes utility providers, commercial enterprises, and industrial operators seeking sustainable energy solutions. Details regarding the revenue structure of Flux XII, Inc. reflect a B2B model, primarily engaging with utility companies and large-scale commercial enterprises. The company operates through direct sales agreements and strategic collaborations, securing ongoing access to its flagship products designed to meet the specific energy storage needs of large facilities.

Revenue is generated through the sale of these advanced storage systems, with pricing plans structured around the customization and scale of the solutions provided. This business model supports ongoing relationships, fostering repeat transactions as clients optimize their energy management capabilities through Flux XII's technology. In November 2025, Flux XII Inc. raised USD 3.

95 mn in Seed funding, led by Grantham Foundation, to expand operations and development efforts. The company plans to launch new products aimed at enhancing its advanced flow battery systems and is targeting further expansion into European and Asian markets by 2026.