More than 1,300 homes in and around Lakenheath were hit by power cuts on Friday following an underground fault - which should only have affected around 500 properties.
A fault with the underground systems, managed by UK Power Networks, meant 535 residents in Broom Street and The Common experienced power cuts at around 4pm.
However, more than 800 other homes, as far away as West Row, suffered interruptions to their power supplies as a result of the fault.
A spokesman for UK Power Networks said its engineers had worked to fix the initial fault in 20 minutes, but the unexpected outages took another five hours to rectify.
The spokesman said: “Following a fault on the underground electricity network system customers in the areas of Broom Road and The Common, Lakenheath would have seen an interruption to their power.
“The fault affected 535 customers and UK Power Networks engineers worked as quickly and safely as they could to restore power within 20 minutes.
“However a further 828 properties saw an interruption to power at around 4.05pm and these customers were restored in stages with all power supplies back on around 9.25pm.
“We understand how difficult it is to be without power and apologise for any inconvenience caused by this incident.”