The windmill that revolutionised wind power

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In 1978, with energy prices rocketing due to the oil crisis, a group of volunteers in Denmark took matters into their own hands and built a wind turbine to power the town's school. They called it Tvindkraft and its design revolutionised the wind industry. Rachel Naylor speaks to Britta Jensen, a teacher from the school, who worked on the turbine. (Photo: Tvindkraft. Credit: Tvindkraft)