The Effect of Intermittency On Merit Order
The zero marginal cost of wind energy does not, however, translate, into zero marginal cost of peak load electricity in a competitive open electricity market system as wind supply cannot be dispatched to meet peak demand. The purpose of the merit order was to enable the lowest net cost electricity to be dispatched first thus minimising overall electricity system costs to consumers. Intermittent wind might be able to supply this economic function provided peak wind supply and peak demand coincide both in time and quantity. On the other hand, solar energy tends to be most abundant during peak energy demand, maximizing its ability to displace coal and natural gas power.
A study by the Fraunhofer Institute in Karlsruhe, Germany found that windpower saves German consumers 5bn euros a year. It is estimated to have lowered prices in European countries with high wind generation by between 3 and 23 euros per megawatt hour. On the other hand renewable energy in Germany increased the price for electricity, consumers there now pay 52.8 €/MWh more only for renewable energy (see German Renewable Energy Act), average price for electricity in Germany now is increased to 26 €ct./KWh.
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