Huge reservoirs in the country's mountains can become "Europe's storage battery" — if existing facilities are refurbished, new pumped storage plants built, and cables stretched across the North Sea.

Then Norway's hydropower can replace coal- and gas-fuelled power generation in the British and German electricity markets.

Every terawatt hour (TWh) exported will reduce CO² emissions by at least 350,000 tonnes.

The volatility created by more wind-energy production increases the need for flexible power generation.

Billions