| Data point | Valid in | Capital cost | Operating cost excluding fuel | Source | |
|---|---|---|---|---|---|
| £(2010)/kWpeak | £(2010)/kWpeak | ||||
| Severn Tidal Barrage | 2000-2050 | 1943 | 30–56 | Markal 3.24 | |
| Tidal Barrage | 2010 | 2475–4125 | 20–42 | MottMacDonald (2011) | |
| Tidal Barrage | 2050 | 1815–3568 | 13–21 | MottMacDonald (2011) | |
| 2010 Range | 2010 | 2475–4157 | 13–42 | 2050 working assumption | |
| 2010 Range | 2050 | 1631–4157 | 13–42 | 2050 working assumption | |
| Default - Tidal Range Technology €“ Severn - Bridgewater | 2010 | 3423 | 32 | MARKAL 3.26 | |
| Default - Tidal Range Technology €“ Severn - Bridgewater | 2050 | 3423 | 32 | MARKAL 3.26 | |
| Range | 2000-2050 | 1631–4157 | 13–56 | ||