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Energy Ball

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This article is about the Combine ball. For the Aperture Science energy ball, see Aperture Science High Energy Pellet.

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Ball 2.png
Energy Ball
General information



Dark Energy

Used by
Game information


The Combine Energy Ball,[1] also known as Energy Orb,[1] is a concentrated sphere of Dark Energy plasma, a form of exotic matter that disrupts space-time and distorts light.


Energy Balls are generated by Combine Dark Energy reactor systems and transmitted through the plasma conduits of Citadel power transfer systems. Energy Balls can be contained within specialized dark energy cores, portable long-term storage devices that can later be used in Combine dark energy devices. As well as power generators, dark energy cores can be used by the Pulse Rifle, which can store the energy until released by the rifle's secondary fire.

Energy Balls repel themselves from matter of sufficient mass and density, bouncing off walls, ceilings and floors without losing inertia. However, when they strike matter of low density or mass, they are destroyed, causing them to dissolve into nothing. Gordon's HEV Suit, being plated, may explain why the player will sometimes deflect the orb rather than absorb it upon impact.

Energy Balls are subject to zero-point energy fields, allowing them to be grabbed and manipulated by the Gravity Gun. OSIPR-fired Energy Balls can be caught by the Gravity Gun and fired back at their source. Doing this will earn the "Think Fast!" achievement.

Strangely, the Energy Ball seems to be somewhat attracted towards organic matter. When bounced off a solid object, the Energy Ball is likely to slightly change direction towards the nearest enemy despite the fact that its vector should point elsewhere. The angle of deviation appears to be less than 10° though. Whether this is a physical behavior of the ball or a "help" from the developers to assist the player scoring multiple hits with one ball, is unknown.

The Energy Ball is used towards the end of Half-Life 2 to disable Combine Force Fields and ground turrets in the Overwatch Nexus.

The player is required to use the Gravity Gun to force the orbs from Combine Power Generators and thus disable the connected components.

Related Achievements[edit]

Any Half-Life 2 game
Hlx kill enemies withoneenergyball.png Conservationist (5G)
Kill five enemies with the same Energy Ball.
Hlx kill elitesoldier withhisenergyball.png Think Fast! (10G)
Kill an Elite Soldier with his own Energy Ball.

Behind the scenes[edit]

In Portal, the "Aperture Science High Energy Pellet" bears a remarkable resemblance to the Energy Ball. However, it is unknown if the two have any relation.


List of appearances[edit]

Main games[edit]



  1. 1.0 1.1 Half-Life 2 Prima Guide