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Year  |
Cost | MWh | Average Price |
| 2021 | £139,897,381 | 2,292,463 | £61 |
| 2020 | £274,161,002 | 3,696,019 | £74 |
| 2019 | £138,992,769 | 1,940,178 | £72 |
| 2018 | £124,649,106 | 1,724,187 | £72 |
| 2017 | £108,247,860 | 1,542,285 | £70 |
| 2016 | £81,861,075 | 1,134,627 | £72 |
| 2015 | £90,738,134 | 1,276,264 | £71 |
| 2014 | £53,261,058 | 659,350 | £81 |
| 2013 | £32,707,351 | 379,817 | £86 |
| 2012 | £5,924,231 | 45,463 | £130 |
| 2011 | £12,826,756 | 58,708 | £218 |
| 2010 | £174,128 | 976 | £178 |
