English Glossary

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May refer to: 1) Speed, 2) Normal to a surface 3) lifetime of the project

N-1 security

Ability of a power system to continue its unrestricted operation in case of failure of any one component.


The nacelle of a wind turbine contains the gear box and the generator. It is mounted at the top of the tower.


Nationally Appropriate Mitigation Action


sodium nickel chloride


Sodium Sulphur


National Aeronautics and Space Administration

Natura 2000 Site

Designated European sites that constitute Natura 2000 network of protected sites for habitats and species across the EU. They are defined in combination of Special Areas of Conservation and Special Protection Areas.

natural monopoly

A natural monopoly is a monopoly in an industry in which it is most efficient (involving the lowest long-run average cost) for production to be permanently concentrated in a single firm rather than contested competitively. Examples are infrastructures, such as electric power grids or natural gas grids, which cannot be operated in economic competition. Investment in these infrastructure will not justify parallel setups.


National Designated Authority


Nationally Determined Contribution

negative load

Distributed generation is sometimes seen as negative load, as it reduces the load on a feeder.


A tort involving failure to use a degree of care considered reasonable under a given set of circumstances. Acts of either omission or commission, or both, may constitute negligence.


North American Electric Reliability Corporation

net calorific value

The amount of heat released by a unit weight or unit volume of a substance during complete combustion. Lower than gross calorific value. For most combustion processes, the net calorific value is the relevant parameter.

net cash

A company's total cash minus total liabilities when discussing financial statements. Net cash is commonly used in evaluating a company's cash flow. More generally, net cash can refer to the amount of cash remaining after a transaction has been completed and all charges and deductions related to the transaction have been subtracted. (Syn. net cash flow).

net metering

Net metering allows residential and commercial customers who generate their own electricity from renewable power to feed electricity they do not use back into the grid, and to obtain credits for it.

net operating income

The net operating income equals all annual costs minus the annual revenue. The initial investment costs are not included in the net operating income.

net present value

NPV - the net present value or net present worth (NPW) is defined as the sum of the present values (PVs) of incoming and outgoing cash flows over a period of time.

network topology

"The physical structure of an electrical grid.

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