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Denis writes:

>Modern wind turbines generate ~ 1 Megawatt of power.  That is a big
number.  After applying the 'capacity >factor' (the fraction of max.
that you can hope to get 365 24/7) of ~ 35% that is still 350 Kilowatts.
I have no feel >for these things but that is still a big number. 

Yabbut, the li’l pinwheel they’re installing at Bolton is a pipsqueak,
a mini, not a mega-mill.   It’s only 125’ tall, with 33’ blades. The
BLADES on a typical mega-mill are on the order of 100’ (about as long
as the Bolton unit’s tower!)  With 33’ blades it’s probably rated at
~150-200kilowatts peak, but there are a lot of hours in a year…  The
article mentions an annual yield of 350 megawatt-hours- to crank out
350megawatt-hours in a year it only needs to average 40kw, which is
credible for a reasonably (but not necessarily optimally) located mill
in the the 150-200kw peak range. 

If 350 megawatt-hours is 1/8 of the annual power used at Bolton, their
annual power use runs to 2.8 gigawatt-hours, heavily loaded in the
December/January snowmaking season- not the summer air-conditioning
period.  Yeah, that’s a pretty big number compared to a single-family
dwelling’s use (the US average is ~10kwh/year, including the heavily
air-conditioned south- Yankees typically use less) but microscopic
compared to even a small aluminum smelter. :-) 

FWIW: The mill at Jiminy Peak is rated 1.5 megawatts peak and sports
37-meter (121 foot) blades- about an order of magnitude more mill than
the Bolton unit.

dana
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