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That's all for now, but you can catch up on today's developments in the key points above.

We've also done a brief round-up just below this post - scroll down to 20:16.

The Bakerloo line has been suspended for several hours today, but TfL's website has updated its status in the past few minutes.

It's now running, but with severe delays, all due to the earlier power outage.

If you're just joining, or you want a recap, here's the state of play so far:

• A cable fault caused a fire at an electrical substation in the west London area of Maida Vale, the fire brigade said;
• It led to disruption on the Elizabeth, Bakerloo, Jubilee and Northern lines;
• The National Grid apologised for the fault, which they said was resolved in "seconds";
• Passengers had to be evacuated and stations around central London were shut;
• Some lines remain suspended, as TfL staff and engineers work to restore the entire network.

TfL has confirmed Piccadilly Circus has now reopened.

The Piccadilly line stops at the station, and that is still running, albeit with minor delays west of Acton Town.

The Bakerloo line, however, is still suspended, so passengers only have the Piccadilly line to catch here. 

The Elizabeth line was one of the worst affected during today's power outage, but TfL now says it is running a "good service".

The outlook is not quite as bright elsewhere on the Tube.

Here's how it looks as of around 7.20pm:

• Bakerloo - suspended
• District - suspended between Turnham Green and Richmond; severe delays between Earl's Court and Tower Hill
• Jubilee - severe delays
• Mildmay - no service between South Acton and Richmond; severe delays on the rest of the line
• Circle - minor delays
• Hammersmith & City - minor delays
• Northern - minor delays
• Piccadilly - minor delays between Acton Town and Heathrow/Uxbridge

Not all of those lines are impacted directly by the power outage.

The District, Mildmay, Circle and Hammersmith & City lines are disrupted by other issues.

We've had a few of you writing in with your experiences from today's disruption on the Tube.

Rob told us he bought a ticket from Tunbridge Wells to Plymouth for 拢140, with 拢160 spent on his hotel ahead of a business meeting tomorrow morning.

"I did not make it to Paddington on time for my scheduled train... every taxi was busy," he said.

"Got to Paddington only to be told, 'sorry you missed your train, and you need to buy another ticket for a further 拢140'."

He said he has lost 拢300 today, with "nothing at all I could have done about it".

"I am now on my way home to Tunbridge Wells and can't attend my meeting tomorrow," he said, adding the only positive out of the day were his 17,000 steps.  

Stranded

Another wrote in to say she walked to five different stations today, only to find each was closed when she arrived.

"Only on the last station did I find out it was a power outage affecting the entire underground, after I approached ticketing staff," she said.

"Again, no announcement made. So I looked for bus alternatives. In total, I spent two hours stranded in central London. Horrible experience.

"I feel bad for people who possibly missed their flights."

Some more now on what was behind the disruption today.

According to the London Fire Brigade, a cable fault led to a fire at an electrical substation in Maida Vale, west London.

The substation was between Cunningham Place and Aberdeen Place.

It's understood firefighters were called to the substation and three metres of high voltage cabling were destroyed.

It comes weeks after a fire at the same substation, which saw elderly and vulnerable residents among those moved from their homes.

But today's fire is understood to have involved different equipment to the parts in the 29 April incident.

National Rail has warned of delays after a "failure of the electricity supply between King's Cross and Alexandra Palace".

One passenger on board a train from Alexandra Palace has told us the lights "have gone off" and they have "no clue when [they] will move again".

Here's the latest from TfL:

• Bakerloo - suspended
• Circle - severe delays
• Elizabeth - severe delays between Paddington and Heathrow/Reading and between Whitechapel and Shenfield; minor delays elsewhere
• Jubilee - severe delays
• Mildmay - suspended between Highbury & Islingon and Stratford; severe delays on the rest of the line
• Piccadilly - severe delays between Acton Town and Heathrow terminals/Uxbridge; minor delays on the rest of the line
• Suffragette - suspended
• Weaver - suspended
• Metropolitan - minor delays between Harrow-on-the-Hill and Aldgate; good service elsewhere
• Northern - minor delays
• Waterloo & City - minor delays

That's the full list of status updates, but not all these lines are impacted directly by the power outage.

The Circle, District, Suffragette, Metropolitan and Waterloo & City lines are either delayed or suspended due to other issues.

The National Grid has apologised for a fault on its transmission network in central London today.

"The fault was resolved within seconds and did not interrupt supply from our network," it added in a statement.

But a consequent "voltage dip" may have "briefly affected power supplies on the low voltage distribution network in the area", a spokesperson said.

It's believed a cable fault caused a small contained fire, which was brought under control by firefighters.

TfL has said it is still working on getting the entire network back up and running - see the post below this one.