Haemostasis is very important in laparoscopic surgery. Vessel sealing with energy devises play a major role in keeping the surgical field clear. Energy devices are also used for tissue sealing and transection. Despite never types of energy devises electro-surgery is still very popular in gynaecological laparoscopy. Desiccation, dissection, and coagulation are the main effects of electro-surgery that are used for various purposes. Higher thermal injury with monopolar devices lead to the invention of bipolar devices with less tissue damage. Ligasure, pk gyrus, ENSEAL are some of the more advanced bipolar devices. Ultrasonic devices have the capability of coagulation and cutting tissues. During the process it can produce significant thermal injury. Thunderbeat combines bipolar and ultrasonic energy for coagulation and cutting respectively for more precise effects. Laser devices emit a beam of photons with a high degree of spatial and temporal coherence with tissue effects depending on the time of exposure and power density. CO2, Argon, Nd: YAG, KTP-532 are different laser types with different properties. Plasma is the fourth state of matter following solid, liquid and gas. Argon neutral plasma (System 7550TM ABC, Cardioblate) can produce energy in 3 forms including light, heat and kinetic energy. Laser and plasma energy are gaining more popularity for endometriosis surgery due to its localised effects and better preservation of ovarian follicles.