Agreed, the infrastructure bill was the more important of the two for our purposes; however, the BBB has a significant tax incentive for new buyers to purchase electric:

"A tax credit of at least $4,000 would be on offer for those buying an electric vehicle. If the car is bought before 2027, there would be an additional tax credit of $3,500. If the car was made in the US, there would be $4,500 added on top of that. In total, a taxpayer in the US could expect a maximum of $12,500 in tax credits for purchasing an electrical vehicle under these conditions – a weighty incentive to switch from a gas-fueled engine."

https://amp.theguardian.com/us-news/2021/oct/18/what-is-build-back-better-crash-course