Overview
EmPower is a brand name that refers to three different power outlets available on commercial airlines:
15-Volt, 75 Watt DC connector (now called EmPower Classic by the vendor)
5-Volt, 10 Watt USB power-only jacks
110-Volt, AC power jacks (some also have an EmPower USB jack)
Original 15-Volt EmPower Connector
15 volt DC connector type found on many commercial airlines designed to provide power to travelers' electronic devices. The system is limited to 75 watts. The use of a special connector is to prevent laptops charging at altitude and ensure that only approved adapters can be used.
Some airlines offer it only in business class or only in certain types of aircraft or flights. Travelers in the 2000s bought EmPower adapters, frequently from duty-free shops at airports, to run laptops and other electronic equipment without using battery power.
Supporting airlines include:
Some Air France flights
Some Air India flights
Some American Airlines flights
Some British Airways flights
Some Qantas flights
Some United Airlines flights
Some Virgin Atlantic flights
Almost all Alitalia flights
Almost all Cathay Pacific flights
Others (The SeatGuru web site contains more detailed information on which flights support EmPower)
From Wikipedia (CC BY-SA 4.0).