New Delhi, June 15 -- The UK's race to increase renewable energy sources has intensified with the announcement of plans to close another coal-fired power station.

The news on Thursday came as last winter was revealed to be the greenest yet for the country's energy system, after strong winds produced more renewable electricity and coal-fired power dwindled.

SSE said Fiddler's Ferry near Warrington, Cheshire, the energy company's last remaining coal-fired power station, would close in March 2020, reducing the UK's coal-fired energy fleet to five plants.

The UK energy system's greenest winter on record

Percentage of total winter electricity provided by each fuel type*, 2018-19

National Grid, the operator of the UK's electricity network,...