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Renewables: the payback (as estimated during project design)
ÌýPredicted energy outputPredicted CO2 emissions cutEstimated payback
Three 15kW wind turbines63,000kWh/yr 35,784kg CO2/yr15.4 years*
120m² photovoltaics11,908kWh/yr 6764kg CO2/yr24.3 years*
50kW biomass boiler32,000kWh/yr 5409kg CO2/yrNo payback*
Solar thermal panels1840kWh/yr 77kg CO2/yr12.4 years*
*including for maintenance and energy savings, allowing for fuel inflation
%3Cb%3EPredicted operational carbon emissions:%3C/b%3E
As-built Part L assessment (regulated CO2 emissions only) %3D -7.3kgCO2/m²/yr
Total operational carbon emissions (both regulated and non-regulated CO2 emissions calculated according to BREEAM true zero carbon method) %3D -6094.89kg CO2/yr