Tesla has started building its next-generation Megapack 3 grid battery, with the first units rolling off the line at the company’s new Megafactory in Brookshire, Texas.

The plant went from groundbreaking to production in 16 months and is designed to build 50 GWh of Megapack 3 a year. That’s the version Tesla says packs roughly 28% more energy into the same footprint as the Megapack it replaces.

The FCC added foreign-made connected power inverters to its Covered List on July 28, cutting off the federal authorization new models need to be imported, marketed, or sold in the US.

It’s aimed at the radios inside modern inverters, not the power electronics. And it lands on a market where US factories are on track to supply just 40% of combined solar and battery demand next year, according to testing firm Intertek CEA.