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In private households, a substitute for the expensive heating-
oil was the most urgent need. As a consequence most new wind
turbines were designed for heat production with a DC generator
producing power for a heating element or using a mechanical churn
system. But some of the new pioneers wanted to produce AC and
connect the wind turbines to the public grid (like Agricco did in
1919 and Johannes Juul in 1950). One of them was the carpenter
Christian Riisager. He built a small 7 kW wind turbine in his
garden at Skærbæk, near Herning in central Jutland and in 1975 he
tried—without permission—to ...