The use of energy weapons is not a very common skill in the Vault. Energy weapons had just started to come into actual use in warfare, when the world blew up. Lasers and Plasma weapons are covered by the Energy Weapons skill. Basically, if it uses an energy cell or power pack, and not cartridge ammunition, it falls under this skill.

Initial Level: Starting Energy Weapons skill is equal to 10% + (1% x Agility). Average characters have a 15% skill.