According to project data from SNL Energy, 2,180 MW of wind capacity came online in the first three quarters of 2010, representing a roughly 64% drop from the 6,125 MW placed online in the first three quarters of 2009. A total of 1,308 turbines were placed in service through nine months of 2010, compared with 3,393 turbines in the 2009 period. The average size of turbines coming online dropped from 1.81 MW in the first nine months of 2009 to 1.67 MW over the same period in 2010.

Overall, 20 states had at least 1 MW of wind capacity come online in the first three quarters of 2010, compared to 24 states for this period in 2009.

Illinois led all states for wind capacity brought online at 716 MW and 427 turbines, representing a 256% increase from the 201 MW installed in the first nine months of 2009. Illinois was one of only three states to see a jump in 2010 installations over 2009 levels. The 716 MW came from three projects, the largest of which was the 300-MW Streator Cayuga Ridge South wind farm.

Oregon took the second spot among states for wind capacity coming online in the first three quarters of 2010, with 337 MW and 186 turbines, down from 638 MW seen for the same quarters of 2009, when Oregon also took the second spot.

Among the top 10 states for wind installed in the first three quarters of 2010, Texas saw the largest drop. Wind capacity brought online in Texas dropped 84%, from 1,880 MW during the period in 2009 to just 305 MW during the nine months ended Sept. 30. Texas had just three projects brought online during the year, the largest being the 202-MW Penascal II Wind. The project, owned by Iberdrola Renovables, was brought online in February and uses 84 2.4-MW Mitsubishi turbines.

Forty wind plants had come online in 2010 through the third quarter, with the largest being the 300-MW Streator Cayuga Ridge South project. The project uses 150 Gamesa 2-MW wind turbines, and the Tennessee Valley Authority has a power purchase agreement for the full capacity of the plant through 2030.

NextEra Energy Inc.’s 218-MW DeKalb Wind Energy Center in Illinois was the second-largest project brought online during the first nine months of 2010. The project uses 145 1.5-MW GE wind turbines. Illinois Municipal Electric Agency has agreed to purchase 70 MW of the plant’s output through 2030. American Electric Power Co. Inc. subsidiary Kentucky Power Co. filed in 2009 for Kentucky regulators’ permission to purchase a 100-MW share of DeKalb’s output.

To see a spreadsheet that pulls a current list of all plant generation developments, .

There are only two operating wind farms in the U.S with at least 500 MW online, the 736-MW Horse Hollow and the 663-MW Capricorn Ridge Wind farms, both owned by NextEra. However, nine wind projects were announced with plans for at least 500 MW of new capacity through the end of September.

One of the largest projects announced was the 600-MW Cimarron Bend Wind in Kansas, owned by TradeWind Energy LLC. The project is estimated by SNL Energy to cost $1.3 billion and is the second-largest project planned in Kansas. Cimarron Bend also represents the largest planned wind farm for TradeWind, which currently has no wind plants in operation.

Another 600-MW project was announced during the period when Duke Energy Corp. announced plans for the Las Palmas Windpower Project in Cameron County, Texas. The project is the largest of eight wind projects currently planned by Duke.

Riverstone Holdings LLC’s Ocotillo Express Wind in Imperial County, Calif., was the third-largest wind plant announced in the first three quarters of 2010 with a combined nameplate capacity of 552 MW spread out over two phases.

The 500-MW Lake Michigan Offshore (Aegir II) project made the list of the top 10 wind plants by capacity announced during the first nine months of 2010 and is one of only three offshore wind projects announced so far in 2010. The $2 billion project is jointly owned by Havgul Clean Energy AS and Scandia Wind Offshore. Those companies also plan to develop an additional 250-MW of offshore wind in Michigan through the Lake Michigan Offshore Wind (Aegir I) project.

The first three quarters of 2010 brought a steady amount of wind capacity placed under construction, driven by the Dec. 31 deadline for plants to commence construction to qualify for the U.S. Treasury cash grant program. More than 4,000 MW of wind capacity was been placed under construction in the first three quarters of the year, according to SNL Energy data.

The largest wind project with capacity placed under construction during the period is the Lower Snake River (Garfield) project, with 343 MW, under construction by the end of September. The project is one of two in the works for owner Puget Sound Energy Inc., which already has almost 430 MW of wind currently operating. The plant will use 149 2.3-MW Siemens SWT turbines, carry an estimated price tag of $850 million and come online in mid-2012. An additional 557-MW are planned at the plant but not yet under construction.

The 290-MW Shepherds Flat Central project in Oregon, ultimately owned by Caithness Energy LLC, was the second-largest project with capacity placed under construction during the first nine months of the year. The plant will use 116 of the larger GE Energy 2.5-MW turbines. The project is one of three Caithness has in development in Oregon.

Wind turbine manufacturer financial profiles

GE Energy

General Electric Co., well known for its 1.5-MW turbine model, is a dominant player in the U.S. market. In 2009, GE ranked first in AWEA’s turbine installation rankings, and it continues to perform well in 2010. For the nine-month period ended Sept. 30, GE remained the top manufacturer by U.S. installations with 755 turbines installed, down from 2009’s nine-month period, when GE had 1,556 turbines installed.

GE’s energy infrastructure segment, less oil and gas, revenues in the first three quarters of the 2010 fiscal year fell by 10% compared to 2009 nine-month figures, falling from $24.45 billion to $22.04 billion. GE noted decreased sales of wind equipment in its energy infrastructure segment in the nine months ended Sept. 30. Energy infrastructure profits, less oil and gas, increased in the 2010 period by 6% over the 2009 period, to $4.39 billion from $4.15 billion.

Siemens

Siemens AG U.S. wind turbine installations dropped off significantly in the 2010 nine-month period compared to the 2009 period, falling from 241, totaling 554 MW, to 76, totaling 175 MW. Despite low installations in the U.S., Siemens has maintained its renewable division order intake, at $5.73 billion for the 2010 nine-month period, on par the with 2009 period order figures of $5.71 billion. The renewable division of the company’s energy segment reported increases to both revenues and profits from the 2009 to 2010 nine-month periods.

Vestas

Expecting strong demand from European clients in 2010 and 2011, Vestas Wind Systems A/S had increased its wind turbine manufacturing capacity. However, as the European market fell short of its expectations, Vestas cut 3,000 jobs, mostly in Europe, to adjust the balance. Vestas had only two turbines installed in the U.S. in the first nine months of 2010, compared to the 2009 period, when 409 Vestas turbines were installed. Turbine shipments into the global market were down 43% in the first nine months of 2010, falling to 1,180 actual turbine shipments. Revenue fell 19%, to $4.58 billion, and earnings fell into the negative for the first nine months of 2010. Despite a lower performance in the first three quarters, the company has said it remains optimistic about the future. Orders have increased 175% from the 2009 nine-month period, growing from $2.87 billion a year earlier to $7.89 billion as of Sept. 30.

Suzlon

India-based wind turbine manufacturer Suzlon Energy Ltd. continues to be an up-and-coming player in the global market. Suzlon has most of its manufacturing capacity in China and India, which enables the firm to reap the benefits of lower production costs. The first nine months of 2010 proved to be a slower period in terms of installing Suzlon turbines in the U.S., with 64, totaling 132 MW, installed, compared to the corresponding period in 2009, when 189 Suzlon turbines, totaling 397 MW, were installed.

Suzlon total revenues fell 29%, from $3.8 billion in the first nine months of 2009 to $2.7 billion for the 2010 period. On a segment level, the wind turbine generator business holds the most weight, accounting for 98% of the revenue stream for the 2010 nine-month period.

Mitsubishi heavy Industries

Mitsubishi Heavy Industries Ltd. experienced a decrease in U.S. turbine installations in the 2010 nine-month period, with 147 actual turbine installations totaling 265 MW, compared to 231 installation totaling 554 MW in the same period of 2009. MHI’s power systems segment performed well in the 2010 period, with increases in operating income, sales and orders. Operating income increased 72%, while sales were up slightly. Orders increased 43%, from $6.28 billion for the first nine months of 2009 to $9 billion for the same period of 2010.