The terms of the contract between Whitefish Energy Holdings and PREPA were obtained without a competitive public bidding process.
The call came hours after US president Donald Trump questioned the leadership of San Juan Mayor Carmen Yulin Cruz who pleaded for federal aid.
US president targets San Juan's Mayor Carmen Yulin Cruz in a series of tweets, accusing her and the island's officials of failing to effectively help those in need.
A shortage of truck drivers and the US territory's devastated infrastructure make it difficult to move the supplies to the areas that need it most.
The ease in restrictions comes in response to Puerto Rico governor's request to waive the Jones Act, which limits shipping between US ports to US owned-and-operated vessels, to ensure there was no impediment to bringing in supplies.
The now Category 5 storm pummels the tiny island nation of Dominica en route to the US Virgin Islands and possibly Puerto Rico.
The storm continues to intensify before hitting the Leeward Islands and the northeastern Caribbean Sea Monday night. Last week's powerful Hurricane Irma left at least 84 people dead.
The storm was downgraded to Category 1 but not before it pummeled central Florida, leaving destruction in its wake.
Florida's governor warned that all of the state's 20.6 million inhabitants should be prepared to evacuate. Miami's beaches, normally packed with sun lovers, were deserted.
The dangerous Category 5 storm is wielding the most powerful winds ever recorded for a storm in the Atlantic Ocean. US President Donald Trump declared emergencies in Florida, Puerto Rico and the US Virgin Islands in preparation of Irma.
As US President Donald Trump and North Korean leader Kim Jong-un try and outdo each other with threats over Guam, what do the residents of the island feel? Is there calm or an exodus to avoid planned Pyongyang strikes? And why Guam?
Despite the low level of participation, Puerto Rican Governor Ricardo Rossello said he would defend the result of the referendum that backed the territory becoming the 51st US state.
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