Normally, renewable energy is produced far from city centers. Some, though, would like to see that change. In Hamburg, an ambitious green makeover is underway -- including the transformation of a derelict World War II bunker into a renewable energy plant.
At times during World War II, up to 30,000 people would cram into Hamburg's Wilhelmsburg bunker to take shelter from Allied bombs. The enormous flak tower built during Adolf Hitler's Third Reich was nothing if not sturdy. Indeed, it was so robust that it even survived post-war attempts to blast the block to the ground with dynamite.
For decades thereafter, the bulky eyesore stood derelict. But now, city planners are propelling it into the 21st century, turning it into a flagship renewable energy project.
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