LONDON — When Jakob Bitner was 7, he left Russia for Germany with his parents and sister. Twenty-eight years later, he is set on solving a vexing green-energy problem that could help Germany end its dependency on imported energy from Russia, or anywhere.
The problem: how to make wind and solar energy available 24 hours a day, seven days a week, even if the sun is not shining or the wind not blowing.
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