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<p>Onshore wind power has a very small carbon footprint range relative to other energy
generation technologies, including coal and gas-fired generation, which, in 2012,
emitted, on average, 895 g/kWh and 415 g/kWh respectively (not allowing for emissions
incurred during the manufacture, construction and decommissioning phases)1.</p><p>The
Department does not estimate the gas turbine energy contribution (and therefore related
CO<sup>2</sup> emissions) associated with the reserve generation needed to manage
wind variability specifically, due to complex inter-dependencies of the power system
operational parameters. However, the need for reserve generation to manage intermittent
supply and demand of electricity does not change the fact that any electricity generated
by onshore wind – which in the first quarter of 2014 accounted for around 7% of all
electricity generated in the UK – has a carbon footprint of just 8 and 20g CO2eq/kWh.
Reserve generation displaces the output of existing generating stations to maintain
the balance of supply and demand, so there is no net increase of power on the system
at any one time; therefore the only additional emissions from reserve associated with
wind power is through the inefficiency of running separate generating stations at
part load rather than fewer stations at full-load, which is relatively insignificant
compared to the carbon savings made.</p><p><em><strong>[1]</strong></em><em>Coal and
Gas emissions factors from table DUKES 5C, available at: <a href="https://www.gov.uk/government/publications/electricity-chapter-5-digest-of-united-kingdom-energy-statistics-dukes"
target="_blank">https://www.gov.uk/government/publications/electricity-chapter-5-digest-of-united-kingdom-energy-statistics-dukes</a></em></p><p>
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