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| Energy saving | % of demand | % CO2 reduction | Capital cost | Annual saving at 2007 prices | Payback at 2007 prices | |
| Heat recovery on waste water | 125MWh (h) | 7.3 | 4.2 | £35,000 | £3800 | 9.3 years |
| Rooflight | 45MWh (h) 22MWh (e) | 2.8 | £25,000 | £2900 | 8.6 years | |
| Rainwater harvesting | 910m3 | 11 | £100,000 | £1365 | 73 years | |
| Ground-source heat pump | 500MWh (h) | 29 | 7.7 | £255,000 | £6200 | 40 years |
| Solar thermal | 74MWh (h) | 4.3 | 2.5 | £120,000 | £2200 | 54 years |