Select Committee on Environmental Audit Appendices to the Minutes of Evidence


Annex B

BIFFA SITE PROFILE

    —  38 open sites and 30 closed sites.

    —  Waste input profile—42 per cent municipal, 30 per cent commercial, 28 per cent inert—from 7 million tonnes per annum.

    —  Closed site volume—60 million tonnes waste, open sites 40 million tonnes waste and 80 million tonnes in filled.

    —  Total methane yield 175,000 tonnes per annum of which utilised for power = 71,000 tonnes per annum.

    —  Energy output (100 per cent owned) = 45 Mw.

    —  Other output (JV and combustion) = 40 Mw.

    —  Flared (22 sites) = 43,000 tonnes per annum.

    —  CH4 to atmosphere (22 sites) = 58,000 tonnes per annum.

    —  Oxidised in capping = 6,500 tonnes per annum.

    —  Gas yield derives from approximately 50 million to 60 million tonnes organic material.

    —  Approximate Biffa reserves are 8 million to 9 million tonnes of methane for the next 40-50 years.

—  Theoretical Biffa output = 110 Mw/year representing around 10 per cent of available generating capacity.

    —  Theoretical maximum UK landfill contribution is thus around 1.1 Tw-1.5 Tw.


 
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