This subject is related to the Combine era.

Energy Ball

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This subject is related to the Combine era.

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, a form of exotic energy utilized by the Combine as a source of power and ammunition, and as a weapon.


Energy Balls are a convenient way of using Dark Energy, due to their relatively small size, they can be easily stored and transported.

Energy Balls are generated by Combine Dark Energy reactor systems and transmitted through the power conduits of Citadel. 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 AR2, which can store the energy until released by the rifle's secondary fire.

Energy Balls display extremely elastic behavior, bouncing off of every surface they hit. After an energy ball has been released from its storage for several seconds, it will violently explode, indicating that concentrated amounts of Dark Energy, such as these balls, are extremely unstable outside of controlled conditions. Should an energy ball come into contact with organic matter, the ball will bounce off while the organic matter will be instantly disintegrated and begin ignoring the force of gravity and float briefly before completely vanishing into nothingness.

Energy Balls are subject to zero-point energy fields, allowing them to be grabbed and manipulated by the Gravity Gun. AR2-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, Energy Balls seem to be somewhat attracted to 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°. This could possibly be an intentional property of the balls designed by the Combine, or could possibly be a sort of "lucky shot" aim assist for players to be more combat effective when firing energy balls.

The Energy Ball is used towards the end of Half-Life 2 to power 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 Force Fields to proceed.

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