The dead workers were identified as Oscar Felipe Ordonez Flores, a 42-year-old employee of state-owned Enatrel, and Roger Antonio Duarte, who worked for private electricity distributor Disnorte-Dissur.
The "sad accident" happened when the workers moved one of the bars on an electrical panel that was live during a difficult and complicated repair at Planta Managua, Mansell said.
Power has been restored in Managua, where outages had been reported in several districts.