BERLIN — A week at the American Academy in Berlin leaves me with two contradictory feelings: one is that Germany today deserves a Nobel Peace Prize, and the other is that Germany tomorrow will have to overcome its deeply ingrained post-World War II pacifism and become a more serious, activist global power. And I say both as a compliment.

On the first point, what the Germans have done in converting almost 30 percent of their electric grid to renewable energy from near zero in about 15 years has been a great contribution to the stability of our planet and its climate. The centerpiece of the German Energiewende, or energy transformation, was an extremely generous “feed-in tariff” that made it a no-brainer for Germans to install solar power (or wind) at home and receive a predictable high price for the energy generated off their own rooftops.

There is no denying that the early days of the feed-in tariff were expensive. The subsidies cost billions of euros, paid for through a surcharge on everyone’s electric bill. But the goal was not simply to buy more renewable energy: It was to create demand that would drive down the cost of solar and wind to make them mainstream, affordable options. And, in that, the energiewende has been an undiluted success. With price drops of more than 80 percent for solar, and 55 percent for wind, zero-carbon energy is now competitive with fossil fuels here.

“In my view the greatest success of the German energy transition was giving a boost to the Chinese solar panel industry,” said Ralf Fücks, the president of the Heinrich-Böll-Stiftung, the German Green Party’s political foundation. “We created the mass market, and that led to the increased productivity and dramatic decrease in cost.” And all this in a country whose northern tip is the same latitude as the southern tip of Alaska!