Cuba's electrical grid collapsed again early on Saturday morning, state-run media reported, plunging the entire country into blackout for a second time just hours after authorities announced they had begun reestablishing service.

CubaDebate, one of the islands state-run media outlets, said Cuba's grid operator, UNE, had reported at 6:15 a.m. the "total disconnection of the national electro-energetic system."

"The Electric Union is working on its reestablishment," the brief message said.