With peak demand creeping up to installed capacity Tunisia is in a race against time to beef up its powergen fleet. Renewables are core to its plans but are well behind schedule. Even modest delays to two conventional plants slated for June 2019 start-up could leave the country struggling to meet next summer’s demand peak.

Tunisia’s grand plans to develop 1GW-plus of new renewables capacity by 2020 look doomed. The country has failed to bring online a single solar or wind...