Cuba has completely run out of diesel and fuel oil, the country's energy and mines minister said ​on Wednesday, as the capital Havana faces its worst rolling blackouts in decades amid a U.S. blockade that has strangled the island of fuel, Reuters reported. 

"We have absolutely no fuel (oil), and absolutely no diesel," Energy Minister Vicente de la O said on state-run media, adding that ​the national grid was in a "critical" state. "We have no reserves."