Zimbabweans are being subjected to 19 hours of power cuts a day, because there is insufficient water in the Kariba dam to drive the nation’s main hydropower plant. The worst outages since 2019 are wreaking havoc, causing snarl-ups in Harare, the capital, where most traffic lights are no longer working, and interrupting mobile phone services because batteries used to run base stations don’t have time to recharge. Supermarkets, restaurants and some other businesses rely on generators to keep operating, but they are unable to run them perpetually for an extended period.