Tesla earned $1.8 billion last year from a side hustle

• Tesla earned $1.79 billion selling regulatory credits last year.
• The firm sells them to automakers who haven't produced enough EVs to meet emission regulations.
• Tesla has pulled in $9 billion from the practice since 2009, per Bloomberg.

Elon Musk’s Tesla raked in $1.79 billion in regulatory credit sales last year, according to a recent SEC filing, as it cashed in on rivals failing to sell enough EVs to meet emission regulations.