Volts Can "second life" EV batteries work as grid-scale energy storage?
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Oct 22, 2025 Colin Campbell, CTO of Redwood Materials and ex-Tesla engineer, discusses the innovative deployment of second-life EV batteries for large-scale energy storage. He explains how Redwood Energy plans to maximize the utility of used batteries before recycling, highlighting the potential to create significant grid resources. Colin shares insights on the technology enabling compatibility among different battery types, the rapid deployment of projects like the Nevada pilot, and the economic viability that positions second-life batteries as a cost-effective solution compared to new systems.
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Second-Life Batteries Power Large Pilot
- Redwood Energy deploys used EV packs as grid-scale storage to extract remaining capacity before recycling.
- The pilot pairs 20 MW solar with 63 MWh of second-life batteries powering two 1 MW data centers.
EV Packs Are Overengineered For Grid Use
- Colin explains EV battery packs are robust and experience gentler duty in stationary storage.
- That pastoral life means minimal refurbishment is needed before redeployment.
Design For Minimal Pack Handling
- Keep second-life systems mechanically simple and avoid disassembling packs when possible.
- Use low-labor approaches to make repurposing economically viable.