37Thus, the Court has held that it is not sufficient that the system operators pass on in the electricity sale price to their final customers the additional costs caused by their obligation to purchase electricity generated from renewable energy sources at the statutory rates, where that offsetting is the result only of a practice and not of a legal obligation (see, to that effect, judgment of 28 March 2019, Germany v Commission, C‑405/16 P, EU:C:2019:268, paragraphs 70 and 71).
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