Lets just say if its structural means it hold up the structure..

You mess with it at your own risk..

That socket was installed at the same time the structure wall was casted..

You can mess with the wiring but do not hack out the socket as it maybe a load bearing shear wall ..

especially if you live in a multi storey building..

what is new socket for? if cannot hack, cover with some thing new.
exp. wall paper or something like new deco.

There are few ways to identify between bearing wall and partition wall.
Saw one article in Taobao app yesterday night but managed to remembered three.
1.If you have floor plan, usually those wall with black colouring is the bearing wall.
2. Knock the wall, bearing wall will sound more rigid than partition wall.
3. Bearing wall (around 24cm) is generally thicker than partition wall (10cm to 15cm).

Article for reference:
http://www.wikihow.com/Tell-if-a-Wall-is-Load-Bearing

aesthetic always come with the price;

If don't want to hack, just lay a wire and put another layer of plastering, this mean the entire wall need to replaster. This how some Singapore HDB is doing since thec can't hack the wall, they can plaster another artificial wall, usually doing that for hot water and wiring too.

or Make it industrial feel, expose a GI tube. Need a good workmanship.

Both method will not be cheap.

Want cheap just install normal extension, RM 30 kautim.

Or get the structural plans for the unit and know for sure what walls are load bearing and what are only aesthetic..

failing which.. i really would not mess with them..

if totally different location - for me i will just forget it. concrete is too difficult to hack even if they allow you to

if same location but you just need more sockets - for me I just use extension power outlets. You cant see them if they are hidden behind some cabinet, etc. I bought those Belkin Concealed Outlets and its like a box that hides all the wiring and plugs a bit. If really expose out then go for the expensive Eubiq but if Eubiq is too expensive, there is another brand in the market similar to Eubiq made by Khind - https://forum.lowyat.net/topic/3211511/all

i didnt buy....
got sirim i think

If you installing TV cabinet, hide the socket and put the extension socket inside the cabinet.

Cause all your player will be inside the cabinet. TV wire plug and other direct into the cabinet socket. That will look nice at neatly. This way also don't need to hack anything.

Regarding how to switch ON/OFF, wire a ON/OFF switch out from the cabinet and put at any cabinet wall that convenience.

This is what I do.

do this style haha
expose style
[attachmentid=8426657]

or

[attachmentid=8426658]

for me im looking into this 2 options as i see hacking , cement n plaster cost soo exp n lets say if wire rosak n u wan it to b replaced gonna b a hassle .. so just let it expose