Chris Parton's "simple case" is not so simple (Letters, August 8).
In a mix of wind and thermal sources, if wind power is to be taken as a first priority then the thermal stations are required to operate at part load, a state in which they are at their least efficient and require more fuel to produce their share of the kWhrs. The resulting extra CO2/kWh must be deducted from any perceived saving. We will continue to require thermal stations to meet the demand when the wind does not blow – frequently during times of high pressure weather conditions in winter.
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