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Siemens To Build Submarine DC Interconnector

Posted on February 17, 2012

In a consortium with the Milan-based cable company Prysmian, Siemens Energy will build a submarine dc interconnector in the Irish Sea. The order is worth more than €1.1 billion for the consortium.

Customers are the British grid operator National Grid Electricity Transmission (NGET) and its Scottish counterpart Scottish Power Transmission (SPT), which founded the special-purpose joint venture NGET/SPT Upgrades Ltd. for this grid expansion project.

The grid connection between Scotland and England, designed as a low-loss high-voltage direct-current (HVDC) transmission system, will have a rating of 2200 MW. It will be the first submarine interconnector using a dc voltage level of 600 kV, Siemens said, adding that the highest voltage level used prior was 500 kV.

The Western HVDC Link project will provide additional power transmission capacity on Britain’s transmission system as the U.K. heads toward a low carbon economy. The power link will help to balance supply and demand within the grid sections in light of the continued growth of remote and fluctuating renewables. The link is scheduled to be operational by late 2015, Siemens said.

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