California ZEV mandate (1990-present)
California mandated in 1990 that a percentage of new cars sold be zero-emission. The mandate was weakened in the 1990s but revived in the 2000s and now drives EV adoption across multiple US states.
Early attempts stalled as automakers fought the mandate.
California's rules now shape EV production for a market of 40 million people.
California used the same policy lever as Norway, but Norway's smaller market and stronger incentives produced faster results.
