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Wind and solar power, together with other renewable sources, have overtaken coal as Germany’s most important power source, figures released by the industry group BDEW show. But this milestone in the history of the country’s energy transition must be taken with a pinch of salt, experts warn. The goal to further boost the share of renewables during the next decade is threatened by lagging grid expansion, political indecision, and fears over wavering supply security. All these make it difficult for renewable power companies to plan their next steps in the Energiewende process.