The following table outlines the emissions to atmosphere avoided if a windfarm output replaces a coal-fired power station output, based on a 66 MW windfarm operating at 30% of maximum rated output.
| Emissions to atmosphere avoided (tonnes) |
| Annual | Total (25 years) |
Carbon Dioxide (CO2) | 13,560 | 339,000 |
Sulphur Dioxide (SO2) | 157 | 3,925 |
Oxides of Nitrogen (NOx) | 47 | 1,175 |
| Carbon dioxide is the main gas implicated in global warming. Oxides of sulphur and nitrogen cause acid rain. |