Puerto Rico shut most power generators on the island amid a dispute with LNG supplier, New Fortress Energy.
Shutdown of power units threatens outages during peak summer demand, as ten out of 14 units are affected.
Puerto Rico's energy czar deems New Fortress Energy's cancellation of LNG shipment 'unjustified'; power supply currently relies on more expensive fuel.
The dispute, escalating in recent weeks, involves millions owed by Puerto Rico to New Fortress Energy and concerns over a proposed $20 billion LNG supply deal.