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| what’s the most cost-effective energy technology%3F | |||
| Renewable | £/m² gross floor area | kg of carbon/m² gross floor area | £/kg of carbon saved |
| Ground source heat pump | 32.81 | 1.32 | 24.85 |
| Biomass heating | 28.95 | 4.49 | 6.45 |
| Solar water heating | 14.1 | 1.08 | 13.05 |
| PV rooftop | £850/m² panel | 11.3m² panel | 75.22 |
| Wind turbine | £2000/kW | 290/kW | 6.9 |