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In page Feed-in tariff:

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Feed-in tariff policies typically target a 5–10% return.[citation needed] The success of photovoltaics in Germany resulted in a drop in electricity prices of up to 40% during peak output times, with savings between €520 million and €840 million for consumers.[5][6] Savings for consumers have meant conversely reductions in the profit margin of big electric power companies, who reacted by lobbying the German government, which reduced subsidies in 2012.[6] The increase in the solar energy share in Germany also had the effect of closing gas and coal-fired generation plants.[7]