Table 3. Unscheduled and Preventive Maintenance Costs

Year Number of
PM Visits per
Year
 		Burdened
Labor Cost
($)
 		Burdened
Parts Cost
($)
 		U & PM Cost
per Wind
Turbine ($)
 		U & PM Cost per
Wind Turbine
(cents/kWh)
 		U & PM Cost
for Fleet
($ million)
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
 		4
4
3.75
3.5
3.25
3
2.75
2.5
2.5
2.5

 		6,336
6,336
5,940
5,544
5,148
4,752
4,356
3,960
3,960
3,960

 		3,752
3,752
3,518
3,283
3,049
2,814
2,580
2,345
2,345
2,345

 		10,088
10,088
9,458
8,827
8,197
7,566
6,936
6,305
6,305
6,305

 		0.62
0.62
0.58
0.55
0.51
0.47
0.43
0.39
0.39
0.39

 		0.2
0.8
1.9
3.6
6.2
9.7
13.2
16.8
20.9
25.7
28.3

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