Teesside the four independent unitary authority boroughs of Hartlepool, Stockton, Middlesbrough and Redcar and Cleveland (a renamed Langbaurgh). At this time they were returned to the counties of North Yorkshire and County Durham for ceremonial purposes, with Stockton-on-Tees becoming the only district in England split between two ceremonial counties. In 1998 the neighbouring Borough of Darlington also became an independent unitary authority and this along with the four former Cleveland boroughs form the sub-region of the Tees Valley which is used for statistical purposes and governmental organisation. The name Tees Valley is increasingly promoted for economic and cultural connections, though Teesside,
Teesside EfW enough to provide for 37,500 homes. This means that over the two facilities, 640,000 tonnes of waste will be burned annually, and over 50 MW of electricity generated. This would make Teesside the largest operational EfW centre in the UK outside London. The plant will be a mirror image of the current one, and will create 160 jobs; 25 in South Tyne and Wear, 100 in the construction of the plant, and the rest once the plant is operational. In August 2010, SITA teamed up with Sembcorp UK to build another waste-to-energy facility in the Teesside region. Wilton 11 on