The UK went a full day without using coal to generate electricity for the first time since the Industrial Revolution, according to the National Grid.
The energy provider said the lack of coal usage was a "watershed" moment.
Britain's longest continuous energy period without coal until now was 19 hours - first achieved last May, and again in April 2017.
The government plans to phase out Britain's last plants by 2025 in order to cut carbon emissions.
The 21st April blackout is thought to be the first time the nation has not used coal to generate electricity since the world's first centralised public coal-fired generator opened in 1882, at Holborn Viaduct in London.
To have the first working day without coal since the start of the industrial revolution is a watershed moment in how the UK energy system is changing.
The UK benefits from highly diverse and flexible sources of electricity.
The energy mix continues to change and National Grid adapts system operation to embrace these change.
According to the National Grid, around half of British energy on Friday came from natural gas, with about a quarter coming from nuclear plants.
Wind, biomass, and imported energy were also used.
The last deep coal mine in the UK, Kellingley Colliery in North Yorkshire, closed in December 2015, bringing to an end centuries of deep coal mining in Britain.
National Grid: Know More - The National Grid is the high-voltage electric power transmission network in Great Britain.
- It is connecting power stations and major substations.
- It works for ensuring that electricity generated anywhere in England, Scotland and Wales can be used to satisfy demand elsewhere.
- The UK grid is connected as a wide area synchronous grid nominally running at 50 hertz.
- There are also undersea interconnections to:
1. Northern France (HVDC Cross-Channel),
2. Northern Ireland (HVDC Moyle),
3. The Isle of Man (Isle of Man to England Interconnector),
4. The Netherlands (BritNed) and
5. The Republic of Ireland (EirGrid).
