BLYTH, United Kingdom – The world’s longest under-sea power cables, stretching from Norway to Northumberland, should reduce the UK’s carbon emissions as well as customer bills, according to experts.

The 450-mile-long North Sea Link connects the UK to Norway’s power grid, which is almost entirely sourced from clean hydro-electricity.

From today, two parallel cables will carry 700 megawatts – increasing to 1,400 megawatts over the next three months. When they reach full capacity they’ll provide enough electricity to power 1.4 million UK households.

The joint venture between the UK’s National Grid and Norway’s power operator Statnett took six years and about $2 billion to build.

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