Finland has four nuclear reactors providing about 30% of its electricity. A fifth reactor is under construction and another is planned, to take the nuclear contribution to about 60% and replace coal. Provisions for radioactive waste disposal are well advanced.

In 2020, the hydropower capacity in Finland reached 3,241 megawatts in total. Over the period from 2010 to 2020, the Finnish hydropower capacity increased fairly steadily until 2018 and decreased in the years that followed.

In 2018 the cumulative wind power capacity in Finland was 2,041 MW. In 2018 there was zero new installed wind power in Finland. The wind energy share of total electricity demand was 6 % in 2018 and total consumption was 1.3% in 2014.

Solar energy in Finland is used primarily for water heating and by the use of photovoltaics to generate electricity. As a northern country, summer days are long and winter days are short. Above the Arctic Circle, the sun does not rise some days in winter, and does not set some days in the summer.