Most intrusions have been innocuous, but a nefarious plot could bring down the grid. Experts have suggestions for improving security.

When British security research firm Pen Test Partners spent 18 months analyzing seven popular EV charger models, it found five had critical flaws. For instance, it identified a software bug in the popular ChargePoint network that hackers could likely exploit to obtain sensitive user information (the team stopped digging before acquiring such data). A charger sold in the UK by Project EV allowed researchers to overwrite its firmware.