Solid Power, a Colorado-based battery developer, moved one step closer to producing solid-state batteries for electric vehicles on Monday. The company has completed an automated “EV cell pilot line” with the capacity to make around 15,000 cells per year, which will be used first by Solid Power and then by its OEM partners for testing.

“The installation of this EV cell pilot line will allow us to produce EV-scale cells suitable for initiating the formal automotive qualification process. Over the coming quarters, we will work to bring the EV cell pilot line up to its full operational capability and look forward to delivering EV-scale all-solid-state cells to our partners later this year,” said Solid Power CEO Doug Campbell.

Solid-state batteries differ from the lithium-ion batteries currently used in EVs in that they replace the liquid electrolyte with a solid layer between the anode and cathode. It’s an attractive technology for multiple reasons: Solid-state cells should have a higher energy density, they should be able to charge more quickly, and they should be safer, as they’re nonflammable (which should further reduce the pack density and weight, as it will need less-robust protection).