2020 greenest year on record for UK’s electricity system

12th January 2021 | Commercial Energy

2020 was the greenest year on record for the UK’s electricity system, according to the National Grid ESO. Last year saw the UK’s average carbon intensity – the measure of CO2 emissions per unit of electricity consumed – reaching a new low. According to the National Grid’s data, last year’s average carbon intensity was 181 gCO2/kwh, continuing a new trend which has seen the system decarbonise by 66% in the last seven years.

May 2020 saw both the greenest month on record (average carbon intensity 143 gCO2/kwh and the lowest carbon intensity ever seen on the system – 46 gCO2/kwh on 24 May. During May, 8.75% of electricity generated came from biomass. Significant periods of coal-free electricity generation and record-breaking levels of power from zero-carbon sources were key factors in reducing 2020’s carbon intensity – while record low electricity demand during the nation’s lockdown also contributed.

Greenest year on record

In the spring, the UK saw its longest run since the industrial revolution generating electricity without using coal, lasting almost 68 days between 10 April and 16 June. In total, the nation was powered coal-free for more than 5,147 hours in 2020, compared with 3,666 hours in 2019, 1,856 in 2018 and 624 in 2017. Coal generated only 1.6% of the electricity mix in 2020, compared with almost 25% five years ago.

2020 was also a record-breaking year for renewable power sources. The record for the highest ever level of wind generation was broken several times during 2020, most recently on 18 December (17.2 Gwh) while 26 August saw wind contributing its highest ever share to the electricity mix at 59.9%. Solar also set new records for its highest ever level of generation (9.7 Gwh) and its highest share in the mix (34%) – providing a third of the UK’s electricity supplies on several occasions in May.

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2020 greenest year on record for UK’s electricity system