Giant wind turbine is blowing industry away
Potential to power cities, replace coal, natural gas plants
Twirling above a strip of land at the mouth of Rotterdam’s harbor in the Netherlands is a wind turbine so large it is difficult to photograph. The turning diameter of its rotor is longer than two American football fields end to end. Later models will be taller than any building on the mainland of Western Europe.
Packed with sensors gathering data on wind speeds, electricity output and stresses on its components, the giant whirling machine in the Netherlands is a test model for a new series of giant offshore wind turbines planned by General Electric. When assembled in arrays, the wind machines have the potential to power cities, supplanting the emissions-spewing coal- or natural gas-fired plants that form the backbones of many electric systems today.
GE has yet to install one of these machines in ocean water.
As a relative newcomer to the offshore wind business, the company faces questions about how quickly and efficiently it can scale up production to build and install hundreds of the turbines.
But already the giant turbines have turned heads in the industry. A top executive at the world’s leading wind farm developer called it a “bit of a leapfrog over the latest technology.” And an analyst said the machine’s size and advance sales had “shaken the industry.”
The prototype is the first of a generation of new machines that are about a third more powerful than the largest already in commercial service. As such, it is changing the business calculations of wind equipment makers, developers and investors.
The GE machines will have a generating capacity that would have been almost unimaginable a decade ago. A single one will be able to turn out 13 megawatts of power, enough to light up a town of roughly 12,000 homes.
The turbine is capable of producing as much thrust as the four engines of a Boeing 747 jet, according to GE, and will be deployed at sea, where developers have learned that they can plant larger and more numerous turbines than on land to capture breezes that are stronger and more reliable.
The race to build bigger turbines has moved faster than many industry figures foresaw. GE’s Haliade-X generates almost 30 times more electricity than the first offshore machines installed off Denmark in 1991.
In coming years, customers are likely to demand even bigger machines, industry executives say. On the other hand, they predict that, just as commercial airliners peaked with the Airbus A380, turbines will reach a point at which greater size no longer makes economic sense.
“We will also reach a plateau; we just don’t know where it is yet,” said Morten Pilgaard Rasmussen, chief technology officer of the offshore wind unit of Siemens Gamesa Renewable Energy, the leading maker of offshore turbines.
Although offshore turbines now account for only about 5 percent of the generating capacity of the overall wind industry, this part of the business has taken on an identity of its own and is expected to grow faster in the coming years than land-based wind.
The GE turbine is selling better than its competitors may have expected, analysts say.
On Dec. 1, GE reached another preliminary agreement to provide turbines for Vineyard Wind, a large wind farm off Massachusetts, and it has deals to supply 276 turbines to what is likely to be the world’s largest wind farm at Dogger Bank off Britain.
These deals, with accompanying maintenance contracts, could add up to $13 billion, estimates Shashi Barla, principal wind analyst at Wood Mackenzie, a market research firm.