YOKOTA AIR BASE, Japan — The power problems that have plagued Yokota’s east side since early July should be resolved next week with the activation of a new transformer, according to base officials.

But workers will shut off the power on that side of the base from 6 a.m. to 6 p.m. on July 31 to complete the project, base spokeswoman Capt. Tania Bryan said Friday.

One of the two remaining transformers powering the east side was so close to capacity earlier this week that base officials asked east-side residents to conserve energy until the fix is made.

The east-side power substation flooded after a heavy rain July 5 that also submerged the basements of building 4303 and two other apartment towers. A thousand homes lost power at one point, although most had power restored within a day.

However, 4303 remained in the dark for 10 days after the flooding and is still being powered by a generator. A new transformer has been installed in the building and will be tested July 31. Officials expect the building to switch over to commercial power that day.

Nearly 400 residents were evacuated at the height of the outage. The base commander has since said Yokota needs heavy-duty generators to handle similar outages in the future.

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