Norway is considering reducing the amount of electricity sold to Europe if the water level at these national hydropower reservoirs remains low.

The government prioritizes filling the hydroelectric reservoirs when the water level is very low, the Norwegian energy minister Terje Aasland, said on August 8.

According to Aasland, Norwegian energy set this week will work to set up the framework for such a mechanism as soon as possible.

90% of Norway's electricity comes from hydroelectricity.

Some Norwegian politicians also propose to stop exporting electricity until the risk of energy crisis is gone.

High voltage poles near Chester city, northern Britain, October 24, 2011.

Norwegian move raises concerns about a difficult winter for Europe.

According to Guardian, England, Germany and the Netherlands depend heavily on cheap energy from Norway, in case the OSLLO restricts export, these three countries will be significantly affected.

Other large electricity exporters in Europe, including France, are also facing difficulties.

Europe can draw lessons from the Japanese energy crisis in 2011, from turning off the lights, printers to escalators.

Prime Minister Sanchez revealed that he stopped wearing a tie to save energy and call for ministers and office workers to follow.