Work has begun to lay the underwater cable for the first electricity interconnector between Ireland and mainland Europe. It marks a major milestone in the €1.6 billion ($1.9 billion) Celtic Interconnector project, which will link the electricity grids of Ireland and France to ensure security of power supply. A specialist marine vessel Calypso, from Norway, has begun cable-laying along an 84-km (52-mile) section of the route. Once fully installed, the entire 575-km (357-mile) interconnector will run from east Cork to the northwest of Brittany. It will allow for the exchange of 700 MW of electricity, enough to power some 450,000...