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Yeah you get nice numbers if you ignore the total energy usage. The numbers you gave are only one fifth of Germanys total energy consumption. I was off by 2% though, 3% is covered by renewables. We are not only talking electric, but total energy: heat, oil etc.

http://m.welt.de/debatte/kommentare/article156130737/Energie...

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Renewable energy is usually only framed in terms of electrical power generation, but taking a wider perspective is sensible.

Primary energy is 3704 TWh[0], so 3% jives with the numbers I gave (so you were off by a factor of 3). 27% of that is heating, 39% transportation. The key to reducing those is gains in efficiency, ie. things like insulation, combined heat and power, renewable heat on the one hand, more efficient cars and more public transportation on the other hand.

[0] https://www.bmwi.de/BMWi/Redaktion/PDF/E/energiestatistiken-...

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