PART 1: The real state-of-play and its hidden costs
Denmark generates the equivalent of about 19% of its electricity demand with wind turbines, but wind power contributes far less than 19% of the Nation’s electricity demand.
The claim that Denmark derives about 20% of its electricity from wind overstates matters. Being highly intermittent, wind power has recently (2006) met as little as 5% of Denmark’s annual electricity consumption with an average over the last five years of 9.7%.
In the absence of large-scale electricity storage, any modern electricity system must continuously balance electricity supply and demand, because even small variations in system voltage and frequency can cause damage to modern electronic equipment and other electrical equipment.
Wind power is stochastic,especially in the very short term (e.g., over any given hour, 30 minute, or 15 minute period). This has created a completely new challenge that transmission system operators (TSOs) all over the World are only now learning how to handle. Some draw from Denmark’s experience. But Denmark’s special circumstances make its experience of limited transferability elsewhere.
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Denmark manages to keep the electricity systems balanced due to having the benefit of its particular neighbors and their electricity mix. Norway and Sweden provide Denmark, Germany and Netherlands access to significant amounts of fast, short term balancing reserve, via interconnectors. They effectively act as Denmark’s “electricity storage batteries”. Norwegian and Swedish hydropower can be rapidly turned up and down, and Norway’s lakes effectively “store” some portion of Danish wind power.
Over the last eight years West Denmark has exported (couldn’t use), on average, 57% of the wind power it generated and East Denmark an average of 45%. The correlation between high wind output and net outflows makes the case that there is a large component of wind energy in the outflow indisputable.
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