Energy Target

Energy Target is a specific value that represents an amount of energy up to which a device should be charged.

DHD and Control Panel

Energy Target in DHD and Control Panel specifies how much energy should be sent to the connected Stargate or Transporter.

As long as the DHD or Control Panel will have available energy, they will keep sending it to the Stargate, or Transporter respectively, until they are charged at least to the specified Energy Target. Once the Energy Target is reached, no more energy will be sent.

The Energy Target in DHD and Control Panels is set using Energy Crystals.

Interface

Energy Target in an interface (Basic Interface, Crystal Interface, Advanced Crystal Interface) specifies up to which amount of energy the connected device should be charged. Once the Energy Target is reached, no more energy will be pushed.

The Energy Target in the interface can be set in the GUI opened by right-clicking the interface with empty hands.
Alternatively can be set by computers.