LNG is natural gas that has been converted to liquid form for easier transport and storage.

Liquefaction of gases is physical conversion of a gas into a liquid state (condensation).

In materials science, liquefaction is a process that generates a liquid from a solid or a gas or that generates a non-liquid phase which behaves in accordance with fluid dynamics.

A lineworker is a tradesman who constructs and maintains electric power transmission and distribution lines.

A lineman is a tradesman who constructs and maintains electric power transmission and distribution lines.

An oil platform, offshore platform, or offshore drilling rig is a large structure with facilities for well drilling to explore, extract, store, and process petroleum and natural gas that lies in rock formations beneath the seabed.

Engine crankcases are vented to atmosphere to prevent the build up of pressure due to piston blow-by. The oil-mist separator cleans the gases of oil droplets before being vented to atmosphere.

An oil field is a pool of oil under the surface of the earth, trapped in a sealed hollow of impermeable rock.

Oil and gas reserves are defined as volumes that will be commercially recovered in the future.

An ohmmeter is an electrical instrument that measures electrical resistance (the opposition offered by a substance to the flow of electric current).

An ohmic contact is a non-rectifying electrical junction: a junction between two conductors that has a linear current–voltage (I-V) curve as with Ohm's law.

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

Wind farms that are constructed in the worlds oceans. Offshore wind farms are more expensive to construct, have less of a visual impact but have higer wind speeds and more consistent wind.

Offshore drilling is a mechanical process where a wellbore is drilled below the seabed.

Accomodation units for operation and maintenance teams to live at wind farms that are a long distance from shore based service centers.

Off-the-grid is a characteristic of buildings and a lifestyle designed in an independent manner without reliance on one or more public utilities. Off-the-grid living allows for buildings and people to be self-sufficient.

Energy-generating systems that are not interconnected directly into an electrical grid.

The largest solar furnace located in France, opened in 1970.

A fuels ability to resist compression detonation. The higher the number the more compression the fuel can withstand.

Open Cycle Gas Turbines.