Real capacity factor of wind farms compared to vendor advertisements

From this web page, the following table, actually only the first 3 lines are showed.  I added some rows and calculated:

• Annual MWh at 100%
• This would be produced if the wind turbine would work as advertised 100% of the time
• Capacity factor advertised
• This is the capacity factor, see wikipedia for a good explanation
• Real capacity factor
• This is one real number from 2008 on a wind farm in India, where they got a "good" year.
• Real MWh produced
• So with a capacity factor of 25% in the real world, you only produce 3614 MWh annually from an advertised (named plate) capacity of 14454 MWh

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	1981	1985	1990	1996	1999	2000
Rotor (meters)	10	17	27	40	50	71
Rating (KW)	25	100	225	550	750	1650
Annual MWh advertised	45	220	550	1480	2200	5600
Annual MWh at 100%	219	876	1971	4818	6570	14454
Capacity factor advertised	21%	25%	28%	31%	33%	39%
Real capacity factor						25%
Real MWh produced						3614

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This means that 75% of the energy will come from another source of energy (Coal, Natural gas) to compensate for the intermittent nature of wind farms.

So claiming that a wind farm does not produce any form of pollution is not really telling the whole story.