Homeowners and shops suffered a blackout this morning before the Duke is laid to rest from 3pm.
But the power cut has not affected Windsor Castle, where The Queen is staying, The Sun understands.
A message on the Scottish & Southern Electricity Networks (SSE) power company’s website says the outage was reported just after 9am.
Waterstones was among the businesses affected by the loss of supply this morning.
The book store on Peascod Street is less than half a mile from St George’s Chapel, where members of the Royal Family will gather for today’s service.
A spokesman for the bookshop tweeted: “Due to unforeseen circumstances, we’ll be opening a little late today!
“There’s been a power cut on our street. I’ll update you all as soon as we’re up and running.”
One resident tweeted: “So on the day of the funeral, power cut in Windsor….(diverting all power to those who need it I’m sure).”
The electricity provider aims to restore power to the area by midday, just three hours before Philip’s funeral service begins.