The crisis in the country of 9.6 million people comes at a particularly tense time, and has become more acute since the US ouster of Cuba’s top ally, Nicolas Maduro of Venezuela, on 3 January.
Maduro’s administration supplied about half of Cuba’s fuel.
After his capture, Washington imposed an oil embargo on arch-foe Cuba but later eased it, amid warnings from other Caribbean countries that it could trigger an economic collapse and make everyday people suffer unduly.
Still, President Donald Trump has maintained his blockade of sorts, and oil shipments from Caracas to Havana are in limbo.
Cuban authorities as a result have taken drastic measures, including the suspension of diesel sales, gasoline rationing, reduction of hospital care and teleworking.