If Germany has taken a pioneering though risky role in shifting to renewable energy, then the tiny village of Feldheim - population 150 - is at its vanguard.

The hamlet near Berlin is Germany’s first to have left the national grid and switched to 100 per cent local, alternative energy, swearing off fossil fuels and nuclear power decades before the rest of the country plans to near the same goal. Electricity now comes from a wind park towering…