There was no insulation anywhere and what little residual heat there was soon leaked through the ceiling lath.

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However, its residual thermal energy is enough to sustain heat for billions of years as it slowly dissipates.

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Veolia Environmental Services was the other firm fighting to run the incinerator, and whose spokesperson said it believed it was "sympathetic with the local environment and represented a unique opportunity to use the residual waste to provide a secure source of sustainable energy and heat to the neighbouring Tata Steel steelworks - a major source of employment in the area".

BBC: Artist's impression of a Viridor plant in Cardiff