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Verantwortung
, KfW-Programm Erneuerbare Energien “Speicher”: Finanzierung von stationären Batteriespeichersystemen in Verbindung mit einer Photovoltaikanlage, https://www.kfw.de/Download-Center/F%C3%B6rderprogramme-%28Inlandsf%C3%B6rderung%29/PDF-Dokumente/6000002700_M_275_Speicher.pdf, accessed Jan 15, 2015