https://source.benchmarkminerals.com/article/ira-supercharges-usas-gigafactory-capacity-pipeline-as-it-overtakes-europe-for-first-time

Via google.com/search?q=IRA+gigafactory

There are plenty of articles from NY Times and other major publishers.

It originated there, but has been used for other EV/battery plants for quite awhile. It’s just becoming a genericized term, like band aid and bubble wrap.