The Drawbacks

Energy experts consider Portugal’s experiment a success. But there have been losers. Many environmentalists object to the government plans to double the amount of wind energy, saying lights and noise from turbines will interfere with birds’ behavior. Conservation groups worry that new dams will destroy Portugal’s cork-oak habitats.

Local companies complain that the government allowed large multinationals to displace them.

Until it became the site of the largest wind farm south of Lisbon, Barão de São João was a sleepy village on the blustery Alentejo Coast, home to farmers who tilled its roller coaster hills and holiday homeowners drawn to cheap land and idyllic views. Renewable energy has brought conflict.

“I know it’s good for the country because it’s clean energy and it’s good for the landowners who got money, but it hasn’t brought me any good,” said José Cristino, 48, a burly farmer harvesting grain with a wind turbine’s thrap-thrap-thrap in the background. “I look at these things day and night.” He said 90 percent of the town’s population had been opposed.

In Portugal, as in the United States, politicians have sold green energy programs to communities with promises of job creation. Locally, the effect has often proved limited. For example, more than five years ago, the isolated city of Moura became the site of Portugal’s largest solar plant because it “gets the most sun of anywhere in Europe and has lots of useless space,” said José Maria Prazeres Pós-de-Mina, the mayor.

But while 400 people built the Moura plant, only 20 to 25 work there now, since gathering sunlight requires little human labor. Unemployment remains at 15 percent, the mayor said  though researchers, engineers and foreign delegations frequently visit the town’s new solar research center.

Indeed, Portugal’s engineers and companies are now global players. Portugal’s EDP Renováveis, first listed on stock exchanges in 2008, is the third largest company in the world in wind-generated electricity output. This year, its Portuguese chief executive, Ana Maria Fernandes, signed contracts to sell electricity from its wind farm in Iowa to the Tennessee Valley Authority.

“Broadly, Europe has had great success in this area,” said Mr. Juech, the analyst at Garten Rothkopf. “But that is the result of huge government support and intervention, and that raises questions about what happens when you have an economic crisis or political change; will these technologies still be sustainable?”