--------
In message <043966d4-def4-4bc4-ba9d-ec46070fd...@comcast.net>, Peter Reilley wr
ites:

>Even in the old days a lot of devices were constant load, independent of 
>voltage (within reason).
>Anything regulated such as electric heat, electric hot water, and 
>refrigerators are constant load.

Constant over the long term (hours), but not in the short term (seconds)
where grid stability is most important.

>Utilities found that dropping the voltage was not very effective at 
>shedding load in emergency
>situations.

No, it's no use for shedding load, but keeping things nice and
stable is much easier with a load which converges on your
target parameters, than with a load which diverges from it.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
p...@freebsd.org         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
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