Capture the Plug
Capture the Plug is a game mode in which you have to bring the opponent's plug into your base.
The gamemode seems to be a Cobalt themed version of the common gamemode "Capture the Flag".
 Rules and How To Play
Both teams start out on one side of the field, with a power station containing their plug.
Steal the opponent team's plug by walking past their power station when the plug is in it. This will occupy hands, so using weapons while holding the plug is not possible.
When a player holding a plug presseson the keyboard or the X Button on the Xbox Joy pad (On Standard Preset) or is killed, the plug will be thrown on the ground. When an opponent player picks up the plug they will hold it in their hands. When the plug is picked up by its own team it will be reclaimed and instantly go back to its power station.
Capture the plug by bringing it to your own power station when your team's plug is in it. When both plugs are stolen you have to first reclaim your own team's plug before you can capture the opponents'.
The game ends when either team has reached the set capture limit.
 Video Tutorial