Sweden Turns to a Promising Power Source, With Flaws

“We’ve created a new landmark,” said Mr. Floderus, the project manager of the $280 million wind park, one of the world’s largest, which was built by the Swedish power company Vattenfall.

Yet Sweden’s gleaming wind park is entering service at a time when wind energy is coming under sharper scrutiny, not just from hostile neighbors, who complain that the towers are a blot on the landscape, but from energy experts who question its reliability as a source of power.
For starters, the wind does not blow all the time. When it does, it does not necessarily do so during periods of high demand for electricity. That makes wind a shaky replacement for more dependable, if polluting, energy sources like oil, coal and natural gas. Moreover, to capture the best breezes, wind farms are often built far from where the demand for electricity is highest. The power they generate must then be carried over long distances on high-voltage lines, which in Germany and other countries are strained and prone to breakdowns.

In the United States, one of the areas most suited for wind turbines is the central part of the country, stretching from Texas through the northern Great Plains — far from the coastal population centers that need the most electricity.

In Denmark, which pioneered wind energy in Europe, construction of wind farms has stagnated in recent years. The Danes export much of their wind-generated electricity to Norway and Sweden because it comes in unpredictable surges that often outstrip demand.

In Germany, where 20,000 wind turbines generate 5 percent of the electricity, advocates say wind will be critical to meeting the government’s goal of generating at least 20 percent of all power from renewable methods by 2020. But the industry’s growth is slowing for a variety of reasons.

Germany is running out of places to put the turbines because of restrictions on the location and height of the devices. And rising raw material prices are making wind farms more expensive to build.

“Under the current circumstances, Germany’s climate protection targets are not achievable,” said Hermann Albers, the president of the German Wind Energy Association.

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