Poway business releases cause of blast

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POWAY, Calif. – The industrial accident at Quantum Energy Storage that sent four employees to the hospital Wednesday did not create an explosion but was rather a mechanical problem, according to the company's CEO.

The gaping hole in the roof of the Poway business’ testing facility in the 13300 block of Gregg Street was created when a microgrid, or storage unit, was being tested, according to CEO Tien Nguyen. A build up in pressure sent its cover up and through the roof,

It might be days before investigators figure out exactly what happened.

Three of the injured employees suffered minor injuries, while another had a broken ankle.

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