OpenStreetMap
I added all HVDC Overhead Powerlines ( inclusive electrode lines - with one exception) according the coordinates to Open Street Map, if they were not already shown
These lines are
* Baltic-Cable ( http://en.wikipedia.org/wiki/Baltic-Cable )
* Konti-Skan ( http://en.wikipedia.org/wiki/Konti-Skan )
* Cross-Skagerrak ( http://en.wikipedia.org/wiki/Cross-Skagerrak )
* HVDC Gotland ( http://en.wikipedia.org/wiki/HVDC_Gotland )
* Fenno-Skan ( http://en.wikipedia.org/wiki/Fenno%E2%80%93Skan )
* HVDC Italy-Greece ( http://en.wikipedia.org/wiki/HVDC_Italy%E2%80%93Greece )
* HVDC Volgograd-Donbass ( http://en.wikipedia.org/wiki/HVDC_Volgograd%E2%80%93Donbass )
* SACOI ( http://en.wikipedia.org/wiki/HVDC_Italy%E2%80%93Corsica%E2%80%93Sardinia )
However, I was not able to add the electrode line of SACOI on Corse, as I do not know where it runs ( it looks like a 20 kV line with 2 conductors and such objects can be barely detected on satellite pictures).
Also I was not able to add the electrode line of HVDC Volgograd-Donbass in Volgograd area, as it is not clearly shown.
Hereby people in Bastia area and Volgograd can help.
In both cases
Discussion
Comment from Zverik on 2 November 2011 at 15:03
Nice work! Where did you get the coordinates?
Comment from Obelixx on 2 November 2011 at 15:08
I got the coordinates from the articles in the English Wikipedia.
Comment from Vclaw on 2 November 2011 at 19:35
Many of the coordinates in Wikipedia are actually copied from other sources, which may be copyright. A lot has been copied from Google Maps, or from various national mapping agencies (eg the Ordnance Survey in Great Britain).
So they are not actually under a suitable licence for copying/importing to OpenStreetMap.
See this page: http://wiki.openstreetmap.org/wiki/Collaboration_with_Wikipedia#Importing_geodata_from_Wikipedia
Comment from Obelixx on 2 November 2011 at 22:37
Each fix object on earth should have the same coordinate value in a given coordinate system independent of the source, where it comes from. If this is not the case, one source must have somewhere an error!
Comment from Vclaw on 3 November 2011 at 03:26
It is not a question of whether the coordinates are an error or not. It is a matter of copyright. See this page: http://wiki.openstreetmap.org/wiki/Copyright
Specifically "Do not use data from copyrighted maps or any other proprietary data!"
It is not clear whether those coordinates from Wikipedia are from copyrighted maps (eg Google Maps) or not. So please don't add them to OpenStreetMap.
Comment from Zverik on 8 November 2011 at 09:39
Actually, the source is explicitly stated on some listed wiki pages: "Right of way of HVDC Volgograd–Donbass, according Google-Maps. May be imperfect due to low resolution." So, this is not suitable for OSM.