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In page Solar updraft tower:

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A proposal to construct a solar updraft tower in Fuente el Fresno, Ciudad Real, Spain, entitled Ciudad Real Torre Solar would be the first of its kind in the European Union[19] and would stand 750 metres (2,460 ft) tall,[20] covering an area of 350 hectares (860 acres).[21] It is expected to produce 40 MW.[22] At that height, it would be nearly twice as tall as the Belmont TV Mast, which was once the tallest structure in the European Union, before being shortened by 24 metres.[citation needed]