
Jan 28, 2026
Redwood Materials announces final close of $425M Series E to scale energy storage
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Last year, Redwood opened our first R&D lab in San Francisco to be closer to one of the best engineering talent pools in the world. Less than a year later, we’re expanding that footprint by more than four times. The expansion reflects the rapid growth of Redwood Energy and the teams behind it.
Energy storage has quickly become the fastest-growing part of Redwood’s business. Customer demand has accelerated, and our San Francisco teams have played a central role; building, testing, and deploying energy storage systems designed for speed, flexibility, and real-world performance. This work sits at the intersection of hardware, software, and power electronics, with a direct line from lab to commercial deployment.
The expanded R&D space supports growing teams focused on energy systems engineering, integration, and deployment. The work happening here is deeply connected across the company, strengthening Redwood’s broader ecosystem: from battery recycling and critical minerals recovery to large-scale energy storage projects. The expanded footprint includes lab infrastructure designed for hands-on experimentation, rapid iteration, and continued innovation across our energy business.

Expanding our San Francisco footprint is also a reflection of our hiring success. In under a year, we’ve built high-impact engineering teams here and continue to grow alongside San Francisco’s deep technical talent and innovation ecosystem. We’re expanding and hiring engineers across mechanical and electrical engineering disciplines to advance our energy engineering work and support the design, integration, and deployment of our storage systems.
This expansion is an important milestone, but it’s also a signal of what’s ahead. As Redwood Energy continues to scale, San Francisco will remain a critical hub for our work; where ideas move quickly from concept to reality in the place that has long been at the center of breakthrough engineering. We’re growing our team and hiring mechanical and electrical engineers to help design, integrate, and deploy the storage systems powering our energy future.