At the same time, it is a picture that electricity from wind power varies greatly.

In recent days, wind power has on several occasions produced over 40 percent of all electricity in Sweden - more than nuclear power, and sometimes even more than hydropower.

But on December 29, wind power produced only 1.6 percent of all electricity in the country.

These extreme fluctuations mean that the need to be able to store energy grows the greater proportion of electricity that is based on weather-dependent wind power, says Birger Fält.

- It shows that wind power is difficult to plan, but at the same time that the potential to produce electricity is great.

Variations in production

On Friday, the record was also broken for the most electricity in one hour, between 08 and 09 in the morning.

9.53 GWh.

Figures that mean that wind power delivers 90 percent of the theoretical maximum capacity.

The previous records were not that old.

The hourly record was from 19 November and the daily record was from 16 December last year.

Since wind power is being expanded, new production records are expected to be broken from time to time, according to Svenska kraftnät.

The variations in electricity production contribute to the criticism of wind power, and that some in the debate prefer to talk about investing in more nuclear power.

The industry organization Swedish Wind Energy believes that the opportunities to parry the large variations in wind power will increase:

- I think that wind power can be supplemented by hydropower and hydrogen.

Hydrogen and batteries will be able to store energy on days when there is a lot of wind, and then you save water in the power plant dams.

Then there is more energy left on the days when it blows worse, says Tomas Hallberg on Swedish Wind Energy to SVT.

Increased wind power can reduce costs

According to the Swedish Energy Agency, wind power will continue to increase significantly in the next few years, with almost a doubling from 2020 to 2025.

Svensk Vindenergi today presents a report in which it is estimated that the increased wind power will contribute to 20 TWh increased electricity production which pushes down electricity prices by an average of 8 öre per KWh - at least in southern Sweden.

- It may sound a bit when we have seen electricity prices that have increased by several kronor this winter, but seen on an annual basis, this is important for all electricity customers, says Tomas Hallberg.