Performance - Wind Energy: Renewable Energy and the Environment - page 155

White deer
San Jon

Fluvanna
Elida

1400

1300

1200

1100

1000

900

2002 2003 2004 2005 2006 2007

FIGURE 8.6 Annual specific output for wind farms in Texas and New Mexico.

but the number of turbines decreased from 6,400 to 5,267 (January 2007). This meant the average
power per wind turbine increased from 1 MW to around 2 MW, which included the large wind
turbines installed offshore. During the second stage, when offshore wind turbines are installed in
2009-2010, it is expected that wind energy will supply 25% of the electric consumption in Denmark.
The average capacity factor was 25%, while the offshore wind farms in Denmark have capacity fac-
tors of 40-45%.
At the end of 2007, as in previous years, Germany had the largest installed capacity in the
world. The 19,460 wind turbines (capacity, 22,247 MW) produced 39.5 TWh, which was over 7% of
Germany's electricity consumption. From the energy production and installed capacity, the average
capacity factor was 20.4%.
Some average capacity factors for other countries are for 2005, United Kingdom, 28%, and for
2006, Sweden, 19%, and Spain, 25%. Wind farms in Northern Ireland and Scotland have average
capacity factors of 38-40%. The average capacity factor for New Zealand wind farms (322 MW)
in 2006 was 41%.
The performance of the first year for the Nysted offshore wind farm was a wind turbine avail-
ability of 97% and a wind farm availability of 96% [7]. The energy production of around 50 GWh/
month was within the predictions for the wind regime for the first half of 2004. The monitoring
system noticed increased vibration levels in the gearboxes. As the gearbox was designed for easy

TABLE 8.2
Wind Farm Location, Installed Capacity for the Same Manufacturer, Mitsubishi, 1 MW

Capacity
MW

Rotor Diameter
m

Hub Height
m Location City Wind Farm

White Deer, TX Llano Estacado 80 56 60

Fluvana, TX Green Mt., Brazos 60 56 60

100 61.4 69

San Jon, NM Caprock 80 61.4 69

Elida, NM San Juan Mesa 120 61.4 69