Dartford Cable Tunnel
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| Dartford Cable Tunnel | |
|---|---|
| Location | |
| Country | UK |
| Coordinates | 51°28′5″N 0°14′58″E / 51.46806°N 0.24944°E |
| Ownership information | |
| Owner | National Grid plc |
| Construction information | |
| Commissioned | 2004 |
| Technical information | |
| Type | Underground tunnel |
| Type of current | AC |
| AC voltage | 400 kV |
The Dartford Cable Tunnel is a 2.4 km utility tunnel beneath the Thames, upstream of the Dartford Crossing. With a diameter of ~3 m (10 ft), it carries a 400 kV National Grid electrical transmission cable. It is accessible by foot as a crossing of the Thames, but by authorised personnel only.[1][2][3] It was built in 2003–04 at a cost of £11 million (equivalent to £22 million in 2023).[4] The tunnel plays a crucial role in maintaining electrical supply infrastructure beneath the Thames, ensuring reliable power transmission.[citation needed]
