Almost 5,000 homes in the South West, Midlands and Wales have been left without power after Storm Imogen hit with hurricane-force winds.
Engineers have been working through the night to restore affected services, Western Power Distribution said.
Almost 300 Environment Agency flood warnings are in place across the UK amid heavy downpours, with 59 warnings calling for "immediate action".
The South West and Wales are expected to see up to more than 1.5ins (40mm) of rain during Monday.
Inspector Mike Reid went missing following a call-out near Penzance
Outbreaks of rain will continue to move eastwards across the UK this evening.
Storm Imogen - when and where we will see the strongest winds? ITV Weather's Manali Lukha gives the breakdown.