The electricity record was largely achieved due to the high degree of renewables constituting the power coming out of Danish sockets. In total, a little more than 50 per cent of Denmark’s electricity was powered by wind and solar in 2020. Onshore and offshore wind turbines produced just over 46 per cent of Denmark’s consumption of electricity.
In ten years, the share of wind and solar power in Danish electricity consumption has doubled, and it is expected that the production of electricity based on renewables will be enough to cover all of Denmark’s electricity consumption by 2030. To this end, The Danish government has made ambitious plans, including the establishment of two energy islands by 2030. The islands will expand Denmark’s capacity by at least 4 GW.
Supplementary, the Nordic electricity prices in 2020 were extraordinarily low, which entailed a greater Danish import of hydro-powered electricity from Norway and Sweden.
See Energinet report (in Danish) here.