Energy beam

An energy beam also known as a power transfer beam, transfer beam or a remote power feed are all terms for beam projections of energy. The transporters convert objects into an energy beam and back to the original pattern again. Holodecks also create matter from an energy beam using pre-programmed patterns. 

Applications
Starship-mounted phasers could be rigged to deliver a non-destructive energy beam to transfer power away from the ship. Such a beam was used, in 2364, when the crew of the USS Enterprise (NCC-1701-D) revived the spaceborne entity captured by the Bandi of Deneb IV. A phaser beam modified for power transfer was used again in 2370, when the Enterprise-D attempted to stabilize the weather modification network of Caldos II. 

Also in 2364, a remote power feed was used by the Enterprise-D from orbit to power up life support on the Velara III terraforming facility down on the planet surface, after it had been completely powered down. 

In 2368, on a rescue mission to aid a Romulan science vessel, the USS Enterprise-D sent out a power transfer beam from the ships aft tractor beam emitter to bring the Romulan ship back to power. The Romulans on board were worried that the Enterprise crew would discover their interphase generator and created a muon feedback loop intended to destroy the Enterprise. The attempted sabotage was prevented by Lieutenant Commander Geordi La Forge and Ensign Ro Laren who were able to warn Captain Jean-Luc Picard in time. 

In 2369, the crew of USS Enterprise-D used an energy beam projected from the ships navigational deflector in an attempt to transfer power to a Romulan Warbird in distress. 

Energy beam as a weapon
Some types of energy beams could be used as weapons. In 2366, the aliens who abducted several species for study, used an energy beam as a painful punishment device for their captives. 

The armaments of the Voth city ship, the temporal incursion beam of the Krenim weapon ship and the cascading biogenic pulse used by Shinzon on the Scimitar were all different types of energy beams.