Officials at the state power company said that the cause of a 15-minute outage Monday was in Nicaragua.
The Instituto Costarricense de Electricidad said that the regional electrical system shut down automatically shortly after 11 a.m. when a power line between Los Brasiles and Sandino in Nicaragua became disconnected. That divided Nicaragua’s power grid in two with the southern half still being connected with Costa Rica and Panamá. The situation caused what the company called low frequency in the grid, and the automatic shutdown took effect.
Originally the company blamed Honduras for the initial problem.
The firm said that there are many similar events each day but that the robust system usually handles them without a shutdown.
The firm said that there was a second problem about noon Monday but it did not affect consumers.