Boundary Dam’s generating Unit 53 has returned online after a severe electrical short disabled the unit right before peak generation.

The short, which occurred April 27, 2013, caused an estimated $6 million to $7 million loss in surplus power sales between April and July of 2013.

According to industry experts, the unit needed a full replacement of the electrical windings in the generator core. An emergency contract and plan was approved by general manager and CEO Jorge Carrasco.

As a result, Unit 53 was repaired in one year, nearly half the time it takes for this type of project, and $1 million under budget.

Repair costs were estimated at $18 million, which were paid from City Light’s capital improvement projects budget.  Ratepayers were not affected.

Unit 53 was last rewound in 1982 and was scheduled for maintenance in 2017.

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