This project has been nominated for a British Construction Industry Award 2017 in the +£50m category. The project involved the design, procurement, construction, installation, testing & commissioning of a new 240,000 tonnes per year Energy from Waste plant, 65,000 tonnes per year bottom ash recycling plant along with the associated offices and visitors centre in St Dennis, Cornwall. Associated works included the construction of new dedicated access and haul roads (to accommodate the heavy goods vehicles delivering waste and all construction related traffic associated with the scheme) and approximately 2km long 132kV electrical connection onto the National Grid.
The Energy from Waste plant is capable of treating up to 240,000 tonnes of waste that is left over after recycling each year and from this generating energy in the form of heat and power. The site exports approximately 16.6MW of electricity which is sufficient to power the equivalent of 21,000 homes. The site also make use of the heat by providing pre-heating within the process, heating the offices and can also export heat (in the form of steam or hot water) should a third party heat offtake be identified.
Adjacent to the Energy from Waste Plant is the bottom ash recycling plant. This processes the non-combustible residues that are left over after incineration. The plant separates out the ferrous and nonferrous metals as well as sorting the residual material (the bottom ash aggregate) into different grades. The aggregate produced is then used as a secondary aggregate for various construction purposes.
Callidus were appointed during the scheme’s final stages of construction (during the early stages of the commissioning), to provide Principal Designer duties under the CDM 2015 Regulations. This corresponded to the end of the transition period and hence the handover from the old CDM Co-ordinator role. The construction of the access and haul roads as well as the grid connection works were all completed under CDM 2007 Regulations prior to the end of the transition period.