Nameplate rating

Rated power consumption of a device e.g. an electric motor. Can be used as the basis of estimating energy consumption over a given time period.

NCV

Net or lower calorific value: heat released in combustion of a unit quantity of fuel, not counting latent heat of vaporisation of water in the products of combustion (contrast GCV)

Negawatt

Witty neologism intended to connote energy saving as an alternative to the deployment of additional supply capacity.

Newsletters, energy snippets for

See Reditorial pages of this web site

Normalisation

Adjustment of observed energy consumption to standardised conditions for the purposes of fair comparison through time or between similar installations or both. See this page for a set of UK standard degree-day values and a brief description of how weather-related loads should be normalised

NPV

Net Present Value. The present value of future cash flows discounted at a chosen rate to reflect the effect of postponement