the Mayor of London and the London Assembly

London DataStore

London Energy and Greenhouse Gas Inventory (LEGGI)

Created 6 months ago, updated 6 months ago

The London Energy and Greenhouse Gas Inventory (LEGGI) shows greenhouse gas emissions and energy consumption from homes, workplaces and transport within the Greater London area.

It is produced on an annual basis to measure progress against the Mayor's carbon reduction targets for London. The LEGGI uses sub-regional energy (electricity, gas and other fuels) and carbon dioxide equivalent (CO2e) data published by the Department of Business Energy and Industrial Strategy for homes and workplaces, and data from the London Atmospheric Emissions Inventory (LAEI) for energy and CO2e data for transport.

BEIS Emission Factors (EFs) are used to estimate greenhouse gas (GHG) emissions from stationary and mobile sources of energy use in the LEGGI. These EFs are produced annually based on the national greenhouse gas inventory two years prior. E.g. 2017 EFs are calculated using national GHG emissions and energy use inventory data from 2015. So, for this 2015 LEGGI we have applied BEIS 2017 EFs to 2015 energy use data to provide a more accurate estimate of GHG emissions in 2015 that is consistent with UK inventory data for 2015.

Interim results show that in 2015, London’s CO2e emissions were 33.9 million tonnes. This is a 25 per cent reduction on 1990 levels and a 33 per cent reduction since the peak of emissions in 2000. This is despite an ever-increasing population – an increase of 28 per cent since 1990. London’s per capita emissions were estimated at 3.9 tonnes of CO2e in 2015.

LEGGI datasets from previous years are also available for download below.

BEIS data on energy consumption can be found here, and regional GHG emissions here, although please note that for LEGGI we do not use weather corrected gas consumption data and so our GHG estimates differ from BEIS.