More than 1,000 Braintree homes were without power after a fault on a high-voltage underground cable.
Power was interrupted to 1,088 properties at about 11pm yesterday in the Hay Lane and Chapel Hill area.
UK Power Networks engineers restored supplies to 879 customers by about 1am today
The remaining customers had their supplies returned to normal by about 3.30am.
A UK Power Networks spokesman said: “We realise how difficult it can be to be without power and apologise for any inconvenience."