Thames Water said the power supply was cut off for safety reasons following the flooding.
According to UK Power Networks, 173 properties remain without power.
The flood water has largely been cleared, although the section of Caledonian Road remains closed.
Customers’ water supply should also be betting back to normal, Thames Water said.
“All customers should have their water supplied restored although they may experience some intermittent loss of pressure whilst we carry out the repair, which will be complex,” a spokesperson for the firm said.
“Our teams worked overnight and made good progress with the excavation to reach the damaged pipe.
“We are also working with UK Power Networks to restore electricity to affected properties as soon as it is safe to do so.”
Customer representatives and loss adjustors are to attend the site to help those affected by the flooding, the spokesperson added.