Low-carbon power is electricity produced with substantially lower greenhouse gas emissions than conventional fossil fuel power generation.

A low-carbon economy is an economy based on low-carbon power sources that therefore has a minimal output of greenhouse gas (GHG) emissions into the atmosphere, specifically carbon dioxide.

Low voltage ride through is the capability of electric generators to stay connected in short periods of lower electric network voltage.

Lot 20 is an EU legislation that was designed to remove inefficient heating technologies from the market and reduce the energy used by products that heat our homes.

Loss s of circulation is the uncontrolled flow of hole mud into a formation, sometimes referred to as a “thief zone.”

In an electrical or electronic circuit or power system part of the energy in play is dissipated by unwanted effects, including energy lost by unwanted heating of resistive components, the effect of parasitic elements (resistance, capacitance, and inductance), skin effect, losses in the windings and cores of transformers due to resistive heating and magnetic losses caused by eddy currents, hysteresis, unwanted radiation, dielectric loss, corona discharge, and other effects.

A loss-of-coolant accident (LOCA) is a mode of failure for a nuclear reactor; if not managed effectively, the results of a LOCA could result in reactor core damage.

Longitudinal waves are waves in which the displacement of the medium is in the same (or opposite) direction of the wave propagation

Long-lived fission products (LLFPs) are radioactive materials with a long half-life (more than 200,000 years) produced by nuclear fission of uranium and plutonium.

How goods, services or people are moved to provide a service to customers.

The logarithmic mean temperature difference (also known as log mean temperature difference, LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers.

Lock Out, Tag Out (LOTO) is a safety procedure used in industry and research settings to ensure that dangerous machines are properly shut off and not able to be started up again prior to the completion of maintenance or repair work.

A local distribution company is a distribution company that maintains the portion of the utility supply grid that is closest to the residential and small commercial consumer.

Load-loss factor is a factor which when multiplied by energy lost at time of peak and the number of load periods will give overall average energy lost.

Load-frequency control is employed to allow an area to first meet its own load demands, then to assist in returning the steady-state frequency of the system, Δf, to zero.

A chart that shows the variation in demand for energy from consumers over a time period.

A process of reducing the load when a transmission system is unable to meet the peak demand requirements.

Load regulation is the capability to maintain a constant voltage (or current) level on the output channel of a power supply despite changes in the supply's load (such as a change in resistance value connected across the supply output).

A load profile is a graph of the variation in the electrical load versus time.

Load management, also known as demand-side managemen, is the process of balancing the supply of electricity on the network with the electrical load by adjusting or controlling the load rather than the power station output.