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.
Former Wales striker Robert Earnshaw has announced his retirement from football.
The 59-times capped forward played for the likes of West Brom, Norwich, Derby and Nottingham Forest after starting his career at Cardiff, where he scored over 100 goals in his first spell at his local club.
Earnshaw also played for Maccabi Tel Aviv in Israel and finished his career in Major League Soccer with spells at Toronto FC, Chicago Fire and Vancouver Whitecaps.
The 34-year-old is joint-seventh on Wales' all-time list of scorers with 16 goals and has scored a hat-trick in the Premier League, Championship, League One, League Two, FA Cup, League Cup and for his country.
Earnshaw's haul included a winner on his debut against Germany in 2002 and a hat-trick at home to Scotland two years later.
"Football taught me how to be a man on and off the field and to be a better person," Zambia-born Earnshaw wrote on the official Whitecaps website.
"After 579 matches and 236 goals later in my 19th year, I can now say this chapter is turning to give me a chance to start a different role and give back what I've learned and experienced.
"I've always been scared to see the end of my playing days and now that it's here I'm sad.
"But I'm also excited that Vancouver Whitecaps FC have given me a chance to become the head coach of the U-14 Pre-Residency team, as well as the club's strikers coach."
A train strike at Arriva Trains Wales is expected to cause travel chaos on the first day back to work after the Christmas break.
Members of the Aslef union are striking for 24 hours over pay and conditions. The company said all its services are expected to be cancelled because of the action.
In a statement the company said: "We deeply regret this disruption and continue to do all we can to avert strike action however we are advising customers to make alternative travel arrangements for Monday 4th January and to check their travel plans for Tuesday morning, January 5th.
"An indefinite train driver over-time ban is also currently in force which may impact some timetabled services until the dispute is resolved."
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The bodies of two men who died in an explosion at Cardiff's Celsa steelworks have been recovered.
Formal identification of the bodies is under way but police have confirmed that factory workers Peter O'Brien and Mark Sim have been unaccounted for since Wednesday's blast.
The cause of the explosion, initially thought to be an industrial accident, has not et been established.
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Prime Minister David Cameron has tweeted that his thoughts are with those affected by the explosion at a steelworks in Cardiff.
Celsa Steel have confirmed two workers were killed in the blast at Celsa Manufacturing on East Moors Road in the Splott area and four had sustained minor injuries.
PM: My thoughts are with those affected by today's explosion at Celsa plant in Cardiff. We have been in touch to offer any help we can.
Two people have died after an explosion at the Celsa steelworks in Cardiff on Wednesday morning.
It happened at 10.30am in the Splott area of Cardiff.
Those nearby described hearing an explosion.
It is with great sadness that we can confirm that two colleagues have passed away and four have sustained minor injuries.Our thoughts and deepest sympathies are with those affected and their families, who have been informed. Our utmost priority is to support all of those involved, and we are in close contact with the University Hospital of Wales, where the injured are being cared for.As soon as the incident occurred, we immediately implemented our emergency protocols and we are working closely with the relevant authorities to investigate the exact causes.
Operations have been suspended and the fire services have confirmed that the Mill is safe.Safety is our paramount concern at all of our facilities and the wellbeing of our colleagues is our number one priority.We wish to thank the emergency services for their rapid response and support.
Two people are missing after an explosion at the Celsa steelworks in Cardiff.
A further five people were injured in the incident on Wednesday at the plant on East Moors Road.
One was treated and discharged at the scene; the other four were taken to the University Hospital of Wales.
Their condition is not yet known.
Emergency crews said the incident is contained to the site, which is currently being searched.
Police, fire and ambulance crews are at the scene. The Health and Safety Executive is also on site.
A fire at the steelworks has been extinguished and a multi-agency operation is on-going to locate two people who are currently unaccounted for.