Energy Efficiency

It is energy efficient when we use less energy to achieve the same result.

Example: insulating a house means that less energy is needed to heat a house to the required level. Replacing an old boiler with a more efficient version means that less fuel is used to provide the amount of heat you need.

Example: we can improve energy efficiency by making changes to how we do things like turning off lights and electronics when we are not using them.

You can find out more about energy efficiency in your home at


Related Terms



Blue hydrogen

Building Energy Rating (BER)

Built environment

Carbon Dioxide/ CO2

Carbon emissions

Carbon footprint


Climate Action Plan

Climate change


District heating

Electricity interconnector



Energy Efficiency

F-gases or fluorinated gases

Fossil fuels


Green hydrogen

Greenhouse Gas Emissions / GHGs

Heat pumps

Liquefied natural gas / LNG


National Energy and Climate Plan

Offshore renewable energy

Renewable Electricity Support Scheme (RESS)

Renewable energy

Retrofitting (energy retrofitting)

Smoky coal