More than 1,800 Didcot homes and businesses lost their electricity supply after building site workers accidentally cut a power cable.
Traders were forced to close early after the power went off at 2.50pm on November 3.
Workers from Taylor Woodrow, the company building the new Orchard Centre redevelopment in the town centre, sliced a major cable.
Corrina Mergel, 22, a stylist at GA Hair and Tanning Salon said: "We had no hot water, no lighting, we couldn't use our equipment or our telephone and our sun beds were off."
The power came back on at about 4.20pm. A Taylor Woodrow spokesman said: "We are sorry to hear that properties in the area where without power . We are looking into how this happened and speaking to contractors working on the site."
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