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efficiency (2) |
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erneuerbare Energie (2) |
efficiency (2) |
Effizienz (2) |
Energieerzeugung (2) |
Energiepolitik (1) |
Energieversorgung (2) |
energy policy (1) |
energy production (2) |
energy supply (2) |
erneuerbare Energie (2) |