Barhale plc, Barhale House, Bescot Crescent, Walsall, West Midlands WS1 4NN www.barhale.co.uk Safety | Communication | Quality | Integrity | TeamSpirit | Caring | Trust | Pride National Grid Cable Tunnel Energy Case Study National Grid supplies electricity through transmission networks, operating at 400kV and 275kV which connects to the three substations at Hackney, St John’s Wood and Willesden to supply points where power is fed into the l

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