How Walla Walla Corps of Engineers is helping in Puerto Rico

Cleveland shortstop Francisco Lindor visits his former grammar school Villa Marina Elementary School in Gurabo Puerto Rico on Monday. Cleveland and Minnesota are playing two games at Hiram Bithorn Stadium

The latest blackout prompted Gov. Ricardo Rossello to call on PREPA to cancel its contract with the subcontractor.

In another blow to its recovery efforts, an island-wide power outage left most of Puerto Rico in the dark, with only a fraction of residents regaining electricity by Wednesday night. He noted it was the same problem that caused a 2016 power outage that affected the entire island.

PREPA said on Twitter that several power plants were back in service, including units at Central Aguirre, EcoElectrica, Central Costa Sur, Yabucoa and Palo Seco.

In 2016, 47% of Puerto Rico's electricity came from petroleum, 34% from natural gas, 17% from coal, and 2% from renewable energy, the EIA reports. That is 97.2 percent of the utility's 1.47 million total customers.

Arty Straehla, Mammoth's Chief Executive Officer, said in a February 28 statement, "Our team in Puerto Rico is executing at a high level". More than 41,000 customers have not had their power restored seven months after the Hurricane Maria.

Nearly two months after making that announcement, conditions are far from normal in Puerto Rico.

The Puerto Rican Electric Power Authority said more than 1.1 million of its clients got their power back after Wednesday's blackout, which came nearly seven months after Hurricane Maria struck.

"This is all very worrisome, obviously, as we approach another hurricane season", said Cathy Kunkel, an energy analyst with the Institute for Energy Economics and Financial Analysis. "The grid is so fragile and they're just barely able to get the lights back on".

Hurricane Maria destroyed Puerto Rico's power grid when it hit the island last September. Outdated power grids like the one in Puerto Rico are becoming less reliable so southern US states such as Texas, Florida, and Louisiana as well as Caribbean Islands started to show more interest in solar energy. In a statement, it said a 140-foot electric transmission tower in southern Puerto Rico collapsed on Tuesday and fell across support wires of an adjacent tower in "an extremely congested" electric transmission corridor.

It is the first island-wide power outage since the storm. "Rebuilding the generating capability of Puerto Rico was not the Corps of Engineers' task".

Mammoth Energy, the parent company of Cobra, said in a statement to ABC News "Cobra is dedicated to the hard work that lies ahead and continues to work around-the-clock with PREPA and the citizens of Puerto Rico to fix the entire infrastructure system to prevent outages such as this one from affecting the entire population on the island".

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