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[Martin_1962]

1GW

Close, but no cigar....+ and -400Kv i.e. a PD of 800Kv at 2500 amps....2GW!

That is a lot - how thick are the cables?

[Marks DTM Calib]

Not sure on the cable cross section as I worked on the control systems when we did a refit of the protection scheme in the 90's. They are (were) the single longest un-jointed cables ever made at nearly 45kms long and were rated at 280Kv AC (remember this is an RMS figure so peek its 400KV which is effectively the DC insulation rating)

You can see the Uk end next to the M20 motorway at Sellindge here:

http://www.multimap.com/maps/#t=l&map=51.106,0.97701|17|8&loc=GB:52.47012:-1.50653

The H shape building is where the valve hall is (stacks of air cooled thyristors) with one valve hall for each pole on either side and the control room in the centre.