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<blockquote data-quote="oldngray" data-source="post: 1799916" data-attributes="member: 45230"><p><a href="http://www.mnforsustain.org/windpower_schleede_costs_of_electricity.htm" target="_blank">http://www.mnforsustain.org/windpower_schleede_costs_of_electricity.htm</a></p><p></p><p>Note that this paper focuses on the <em>true cost </em> of producing and delivering electricity from wind and <em>not on the price </em>paid when a utility buys electricity from a "wind farm." This latter number will often have no relationship to the true cost because of the extensive subsidies available to “wind farm” developers and owners. In fact, in the early years of a “wind farm’s” operation the value of tax breaks and subsidies generally will <em>exceed </em> substantially the income that a “wind farm” owner will receive from the sale of electricity!</p><p></p><p>Actual operating experience is probably around 5 years for the smaller (660 kW – 750 kW) turbines, 2 or 3 years for the 1.5 MW, and a few months for the really big ones like GE’s new 3.6 MW turbine. Anyone claiming to have solid numbers may not be telling the truth. (Also, some manufacturers have had costly problems – e.g., with gearboxes – on big, relatively new machines.)</p><p></p><p>Since the grid or control area must be kept in balance at all times (supply and demand, frequency, voltage), some generating unit(s) must be immediately available at all times to provide backup service (or balance) for the electricity (if any) coming from the wind turbines. This means that the unit(s) providing the backup service may be operating in an automatic generation control mode, running at less than peak capacity, and/or running in spinning reserve mode.</p><p></p><p>Depending on wind conditions, the amount of backup capacity may have to equal the peak capacity of a “wind farm.” That is, if wind conditions exceed the cutout speeds, the entire output of the “wind farm” could be lost.</p><p></p><p>All the potential modes result in costs – and those costs are properly allocated to the cost of the electricity from wind turbines.</p></blockquote><p></p>
[QUOTE="oldngray, post: 1799916, member: 45230"] [URL]http://www.mnforsustain.org/windpower_schleede_costs_of_electricity.htm[/URL] Note that this paper focuses on the [I]true cost [/I] of producing and delivering electricity from wind and [I]not on the price [/I]paid when a utility buys electricity from a "wind farm." This latter number will often have no relationship to the true cost because of the extensive subsidies available to “wind farm” developers and owners. In fact, in the early years of a “wind farm’s” operation the value of tax breaks and subsidies generally will [I]exceed [/I] substantially the income that a “wind farm” owner will receive from the sale of electricity! Actual operating experience is probably around 5 years for the smaller (660 kW – 750 kW) turbines, 2 or 3 years for the 1.5 MW, and a few months for the really big ones like GE’s new 3.6 MW turbine. Anyone claiming to have solid numbers may not be telling the truth. (Also, some manufacturers have had costly problems – e.g., with gearboxes – on big, relatively new machines.) Since the grid or control area must be kept in balance at all times (supply and demand, frequency, voltage), some generating unit(s) must be immediately available at all times to provide backup service (or balance) for the electricity (if any) coming from the wind turbines. This means that the unit(s) providing the backup service may be operating in an automatic generation control mode, running at less than peak capacity, and/or running in spinning reserve mode. Depending on wind conditions, the amount of backup capacity may have to equal the peak capacity of a “wind farm.” That is, if wind conditions exceed the cutout speeds, the entire output of the “wind farm” could be lost. All the potential modes result in costs – and those costs are properly allocated to the cost of the electricity from wind turbines. [/QUOTE]
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