Hyundai tests second-life E-GMP batteries as energy storage for fast chargers

Hyundai Motor Group and LG Energy Solution are testing a used battery energy storage system (UBESS). The demonstration project will examine whether E-GMP vehicle batteries can be reused at fast-charging sites. Here are the key facts:

• The first test installation in Hwaseong, South Korea, has 200 kWh of storage capacity.
• The trial uses batteries from E-GMP vehicles such as the Hyundai Ioniq 5 and Kia EV6.
• It will test peak shaving to reduce demand spikes during ultra-fast charging.

Technology and performance: Testing second-life batteries

The pilot will assess the technical feasibility of using retired vehicle batteries in stationary charging systems. Its 200 kWh storage system contains used battery packs from vehicles built on the modular E-GMP platform. Testing will focus on charging and discharging algorithms, thermal safety and how well the batteries retain capacity as they age under real operating conditions. By storing grid electricity during off-peak hours, the system is intended to absorb demand spikes and reduce strain on the local grid.

Context and infrastructure: Testing a circular battery economy

Automakers are increasingly testing ways to reuse batteries before recycling their raw materials. Like BMW with its storage facility at the Leipzig plant and Mercedes-Benz Energy, Hyundai is examining how used EV batteries can enter a second phase of service. While large commercial storage systems such as the Tesla Megapack use new cells, the UBESS trial focuses on whether used batteries are economical at fast-charging stations. Obstacles to wider deployment include accurately assessing the state of health of used modules and the lack of finalized certification standards.

The UBESS pilot is a practical test of whether a circular battery economy can work. Its results will show whether storage systems using retired E-GMP batteries can be scaled safely and economically over the long term.