Lean manufacturing - Methodology seeking to minimize waste (non-value added activities) in manufacturing processes through the use of inventory management, preventive maintenance, product quality and flexible workforces and production facilities.

Line loss rate - Measurement of the energy lost during the transmission of electricity, a significant portion of which is thermal in nature.

Liquefied natural gas (LNG) - Natural gas temporarily converted into liquid form in order to ensure ease of storage and transport. The reduction in volume is accomplished by cooling the gas until it becomes liquid.

Liquefied petroleum gas (LPG) - Mixture of hydrocarbon gases (typically propane and butane) that are synthesized from petroleum. It is a low carbon emitting fuel source for powering appliances and vehicles.

Liquefied petroleum gas (LPG) vehicles - Vehicles that use LPG as its primary fuel. There are two types of LPG vehicles: 1. those that only utilize LPG; and 2. so called “dual fuel” autos that can use both LPG and conventional gasoline.

Liquid flow batteries - Rechargeable batteries that convert chemical energy into electricity by allowing an electrolyte containing one or more dissolved electro- active species to flow through an electrochemical cell.

Lithium ion (Li-Ion) batteries - Known for their use in consumer electronics, as well as increasingly being used in pure electric vehicles applications. Compared to nickel-metal hydride batteries, Li-Ion batteries enjoy a higher energy density, longer life cycle, more rapid charge and perform better in colder weather.

Local sourcing - Procuring and sourcing building materials within the geographical proximity of their intended use.

Low-flow fixtures - Faucets and other water use systems that use less water than conventional systems but deliver the same or greater benefit to the user.

Low-impact materials - Building materials that use less resources and produce less pollution compared to conventional building materials over their life cycle.