Liquefied Natural Gas (LNG) is a safe, environmentally-friendly fuel. LNG is gas which has been cooled to -162 degrees Centigrade, at which point the gas becomes a liquid.
In most cases CNG and LNG installations are essentially the same - the key differences between the two applications is the way in which the fuel is stored on a vehicle. LNG is stored in special cryogenic cylinders resembling a vacuum flask to retain the cold temperature. Liquefied form is much more dense than natural gas or CNG. It has much more energy for the amount of space it takes up. So, much more energy can be stored in the same amount of space on a car or truck. That means LNG is good for large trucks that need to go a long distance before they stop for more fuel. Refer to CNG Conversions page for details on conversion process.
LNG can be used for all classes of vehicle but is generally used in heavy vehicles which are used frequently (almost daily).
While LNG can be produced on-site from available natural gas, it is typically delivered to the station via tanker truck. In either case, the LNG is stored onsite in special cryogenic storage tanks.
To fuel vehicles, LNG is pumped into the vehicles much like other liquid fuels (although using much more sophisticated cryogenic fueling equipment.)