What does the windmill in Animal Farm represent in Stalin's era?

The windmill in Orwell's "Animal Farm" is usually
considered to represent 'electricity' which was expected to make Communist Russia a
modern industrialized nation. Electricity, of course, was only a means to modernize the
agrarian economy of Russia at the time of the Communist Revolution. In Ch. 5 Snowball's
plans for the construction of the windmill are explained in the following
manner:

After
surveying the ground, Snowball declared that this was just the place for a windmill,
which could be made to operate a dynamo and supply the farm with
electrical power. This would light the stalls and warm them
in winter, and would also run a circular saw, a chaff-cutter, a mangel-slicer, and an
electric milking machine. The animals had never heard of anything of this kind
before (for the farm was an old-fashioned one and had only the most
primitive machinery), and they listened in astonishment while Snowball conjured
up pictures of fantastic machines which would do their work
for them while they grazed at their ease in the fields or improved their minds
with reading and
conversation.

The windmill
could represent a universal symbol for the tall promises which every politician makes to
his gullible electorate. Most of these promises are never fulfilled by the politicians
and even if they are fulfilled they do not work to the satisfaction of the general
public.

This was also the case with Communist Russia.
Electricity was generated and the country was industrialized and modernized but there
was no improvement in the standard of living of the ordinary
people.